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Toyota2003–2023 Critical issues documented

Toyota Prius ZVW30: common faults & what to check

The ZVW30 is the Toyota Prius built 2009–2016. It was sold here with the 1.8 hybrid. Of the 42 faults documented for the Prius, 23 apply to this generation, each with its symptoms, what to inspect and a typical repair cost. Free, no account needed.

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  • NZ owned and operated

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42

Documented faults

Critical

Most serious

$420–$1,100

Typical repair

24

Service milestones

You're looking at the ZVW30 · 1.8 hybrid

Everything below is narrowed to this variant. Pick a different one to change it.

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Now narrow it to the engine

A 1.8 and a 2.4 of the same car do not fail the same way, so the faults below narrow to the engine as well as the year. Free, no account needed.

Which engine is in it?

1.8 hybrid· 1.8 litre hybrid

A 2009 Toyota Prius is the ZVW30 generation (2009 to 2016).

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Toyota Prius ZVW30

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Toyota Prius · 2009

Narrowed to the year. No engine is recorded for this vehicle. Pick an engine to see which faults apply.

Tell us the engine, or check the engine code on the car, before relying on this.

  • No engine is recorded for this vehicle.

matched on year only

What to look out for

The checks worth doing on a Toyota Prius before you hand over any money. Every documented fault is listed below, each with its own page.

  • Serious issue

    Ask for proof the E0E inverter recall/software update was completed - Toyota NZ can check the VIN even on a fresh import.

    See why

    Inverter IPM failure (hybrid system shutdown)

    Gen 3 Prius had a global recall (Toyota campaign E0E, 2010-2014 builds) for intelligent power module transistors in the inverter that can fail, throwing the car into limp mode or shutting the hybrid system down while driving. The recall applied a software fix and replaced failed IPMs, but not every JDM import had it done, and out-of-recall inverter failures still occur at high mileage. Independent shops fit tested used inverters far cheaper than a new unit from Toyota.

    What you would notice

    • Sudden loss of power / limp mode with red triangle and hybrid warning
    • Car won't go to READY
    • P0A94, P324E or similar inverter codes

    Typically $1,200–$4,000 to put right.

  • Serious issue

    Ask the seller for the airbag recall paperwork, and check the VIN with a Toyota dealer or the government recall check before you buy.

    See why

    Curtain airbag inflator can split at a weld recall (ZVW30 Prius, 2009-2012)

    ZVW30 Prius (1.8 hybrid) built from April 2009 to April 2012 were recalled because the curtain shield airbag inflator chambers can separate due to weld cracks. If that happens the curtain airbag may not deploy properly and parts can be thrown into the cabin in a side impact. Toyota Australia recall PRA 2016/15480 replaces the inflators for free. The Australian recall lists export VINs (JTDKN36U). Most NZ Prius are Japanese imports with ZVW30 chassis numbers, so ask a Toyota NZ dealer to check the chassis number.

    What you would notice

    • No symptom in normal use
    • Airbag warning light may come on

    Typically $0 to put right.

  • Costly issue

    Inspect the intake mesh for lint and debris — it should be clear.

    See why

    Traction Battery Cooling Fan Blockage

    The NiMH traction battery pack is cooled by a fan that draws cabin air through an intake grille behind the rear seat. In NZ/AU conditions, lint, dust, and road debris accumulate on the intake mesh and fan blades, progressively reducing airflow. Restricted cooling causes the battery management system to reduce charge/discharge rates to protect cells, degrading hybrid performance and accelerating capacity loss. Complete blockage can cause battery thermal shutdown and permanent cell damage. The fan and ducting are rarely cleaned at standard service intervals.

    What you would notice

    • Hybrid battery bars fluctuate or limit at low SOC even in mild weather
    • Audible change in battery fan speed — often runs at high speed constantly
    • Battery temperature warning on multi-information display
    • Rear seat area noticeably warm even with climate control off

    Typically $0–$400 to put right.

  • Costly issue

    Watch the centre dash display the moment the car is powered on - it should light instantly and completely.

    See why

    Combination meter (dash display) goes blank

    Gen 2 Prius has a well-known combination meter failure: the entire digital speedo/fuel/warning display at the base of the windscreen goes completely dark, usually intermittently at first. The car still drives but you have no speedo, which is a WoF failure in NZ. Toyota ran an extended warranty in the US that is long expired; NZ fixes are a good used cluster or a board-level capacitor repair by an electronics specialist.

    What you would notice

    • Speedo/fuel display completely blank while car still drives
    • Display flickering or taking seconds to wake after pressing Power
    • Display dying then recovering after the car sits

    Typically $350–$900 to put right.

  • Costly issue

    Inspect the ball joint rubber boot for splits, grease loss, or contamination.

    See why

    Front Lower Control Arm Ball Joint Wear

    The Prius front MacPherson strut suspension uses a pressed lower ball joint integrated into the lower control arm. The ball joint stud rotates and articulates under combined steering and suspension load cycles, and the grease-for-life seal progressively deteriorates, accelerating wear in the socket. As radial and axial play increases, dynamic toe and camber angles shift beyond specification under braking and cornering loads, degrading tyre wear and steering response. In advanced failure, the taper-fit stud can pull free of the steering knuckle, resulting in sudden and complete loss of directional control.

    What you would notice

    • Clunking or knocking from front suspension when traversing potholes or speed bumps
    • Feathered or one-sided front tyre wear inconsistent with wheel alignment records
    • Vague or wandering steering feel, particularly under braking
    • Front wheel alignment unable to be brought to specification during routine service

    Typically $320–$720 to put right.

  • Costly issue

    With the car in READY, open the bonnet and look into the smaller (inverter) coolant reservoir - you should see coolant visibly swirling or rippling.

    See why

    Inverter coolant pump failure

    The electric pump that circulates coolant through the inverter and transaxle wears out, and on Gen 2 cars was the subject of a Toyota recall (2004-2007 models) because a failed pump can overheat and destroy the inverter - a $2,000-$4,000 part. Gen 3 pumps also fail, typically from 120,000 km. The pump itself is cheap and any hybrid-savvy workshop can replace it, but ignoring it risks a master warning light, limp mode and inverter damage on a hot day or motorway climb.

    What you would notice

    • Red triangle / hybrid system warning, sometimes only in hot weather or under load
    • No visible coolant movement in the inverter reservoir
    • Inverter cooling fan noise or burning smell in severe cases

    Typically $250–$700 to put right.

Toyota Prius service schedule

The 2 engines a 2009 Toyota Prius was sold with, each with its own intervals. Pick your engine above to narrow this to one. These are the model’s intervals — the car’s own service book is the only thing that can tell you what has actually been done to it.

XW30 (3rd Gen) · 2009–2015 · 1.8L (2ZR-FXE) - Standard Hybrid

Hybrid

Due by distance

  1. 150,000 km

    A deep clean of the EGR valve and cooler keeps the fuel economy where it should be.

  2. 200,000 km

    The hybrid battery may be down on capacity by now, so keep an eye on its health with diagnostic tools.

  3. 250,000 km

    Check the inverter coolant pump, which is what keeps the system's temperature in check.

XW20 (2nd Gen) · 2003–2009 · 1.5L (1NZ-FXE) - Base Hybrid

Hybrid

Due by distance

  1. 150,000 km

    The original struts often start feeling soft here and are worth checking.

  2. 200,000 km

    The water pump is commonly checked or replaced now, since good cooling matters for the hybrid powertrain.

  3. 250,000 km

    Most original hybrid battery packs are down on range by this point, so a health check is well worth having.

See all 23 issues for this oneDocumented for the exact year and engine you picked, including 9 rated critical.
Engine, transmission & cooling1 critical2

01Inverter Coolant Pump Failure – Limp Mode

hybrid2003–2009CoolingRead the full fault: symptoms, where to look, what to ask the seller

02Inverter coolant pump failure

With the car in READY, open the bonnet and look into the smaller (inverter) coolant reservoir - you should see coolant visibly swirling or rippling.hybrid2003–2014Cooling
CommonCooling $250–$700 to fix

The electric pump that circulates coolant through the inverter and transaxle wears out, and on Gen 2 cars was the subject of a Toyota recall (2004-2007 models) because a failed pump can overheat and destroy the inverter - a $2,000-$4,000 part. Gen 3 pumps also fail, typically from 120,000 km. The pump itself is cheap and any hybrid-savvy workshop can replace it, but ignoring it risks a master warning light, limp mode and inverter damage on a hot day or motorway climb.

Symptoms to notice

  • Red triangle / hybrid system warning, sometimes only in hot weather or under load
  • No visible coolant movement in the inverter reservoir
  • Inverter cooling fan noise or burning smell in severe cases

What to check

With the car in READY, open the bonnet and look into the smaller (inverter) coolant reservoir - you should see coolant visibly swirling or rippling. Dead still coolant means the pump is not running. Ask whether the recall was ever done (JDM imports may have missed it) and whether the pump has been replaced as preventive maintenance.

Where to look: Small electric pump low at the front of the engine bay, feeding the inverter coolant reservoir

Parts involved: Water pump.

Ask the seller

  • “Has the inverter water pump ever been replaced?”
  • “Was the Gen 2 inverter pump recall completed on this import?”
Electrical2 critical9

03Inverter Assembly Failure (MG1/MG2 Inverter)

The inverter/converter assembly converts high-voltage DC from the traction battery to three-phase AC for the motor-generators and back.hybrid2009–2015Electrical
OccasionalElectrical $2,200–$6,500 to fix

The inverter/converter assembly converts high-voltage DC from the traction battery to three-phase AC for the motor-generators and back. Internal IGBT transistors can fail due to thermal stress, contaminated inverter coolant, or coolant pump failure causing overtemperature. Failure typically presents as a sudden loss of drive with multiple hybrid system DTCs. The inverter is a sealed unit and is not field-repairable; replacement with a remanufactured or used unit is the standard repair path.

Symptoms to notice

  • Sudden loss of drive power with red triangle warning and hybrid system malfunction warning illuminated together
  • Vehicle enters limp mode or fails to move under its own power despite engine attempting to start
  • Multiple hybrid-system DTCs stored simultaneously (P0A94, P3190, or inverter overtemperature codes)

What to check

  1. Connect Techstream or compatible scanner and check for DTC codes P0A94 (DC-DC converter performance), P3190/P3191 (poor engine power attributed to inverter), or P0A1A/P0A1F (motor inverter overtemperature).
  2. Inspect inverter coolant reservoir for milky or discoloured fluid indicating internal contamination.
  3. Verify inverter coolant pump operation — a failed pump is a common precursor to inverter thermal damage.
  4. Check for burnt smell or discolouration around orange HV cable routing.

Where to look: Inverter assembly mounted on top of the transaxle beneath the bonnet, connected to HV battery by orange-sheathed cables

Parts involved: Water pump.

Ask the seller

  • “Has the hybrid system ever thrown a red triangle or required dealer diagnosis?”
  • “Has the inverter coolant ever been flushed or the inverter coolant pump replaced?”
  • “Is there any history of the car cutting out or losing drive power suddenly?”

04Inverter IPM failure (hybrid system shutdown)

Ask for proof the E0E inverter recall/software update was completed - Toyota NZ can check the VIN even on a fresh import.hybrid2009–2015Electrical
OccasionalElectrical $1,200–$4,000 to fix

Gen 3 Prius had a global recall (Toyota campaign E0E, 2010-2014 builds) for intelligent power module transistors in the inverter that can fail, throwing the car into limp mode or shutting the hybrid system down while driving. The recall applied a software fix and replaced failed IPMs, but not every JDM import had it done, and out-of-recall inverter failures still occur at high mileage. Independent shops fit tested used inverters far cheaper than a new unit from Toyota.

Symptoms to notice

  • Sudden loss of power / limp mode with red triangle and hybrid warning
  • Car won't go to READY
  • P0A94, P324E or similar inverter codes

What to check

  1. Ask for proof the E0E inverter recall/software update was completed - Toyota NZ can check the VIN even on a fresh import.
  2. Scan for historical inverter codes.
  3. On the test drive, accelerate hard up a hill; any stumble with warning lights is a walk-away.

Where to look: Inverter assembly - the large finned aluminium box on top of the transaxle in the engine bay

Ask the seller

  • “Has the inverter recall (E0E) been carried out on this VIN?”
  • “Has the inverter ever been replaced?”

05MG1/MG2 Motor-Generator Bearing Wear

hybrid2003–2015Electrical
OccasionalElectrical $1,800–$5,500 to fix

The Hybrid Synergy Drive transaxle contains two motor-generators (MG1 for engine-start and generation, MG2 for primary drive) mounted with precision bearings in a shared housing. At high mileage — typically beyond 200,000 km — the bearings develop play from contamination or normal wear, producing a distinctive whine that rises with road speed. Bearing failure progresses to rotor contact with stator windings, causing MG2 destruction and complete drive loss. Repair requires transaxle removal and specialist rebuild.

Symptoms to notice

  • High-pitched whine from transmission tunnel increasing with vehicle speed
  • Noise changes character when accelerating versus coasting at same speed
  • Vibration through floorpan at highway speeds
  • P0B44 or MG2 resolver fault codes in HV system

What to check

During test drive, accelerate to 80 km/h then lift off and coast — note whether a whine is present and whether its pitch changes with speed versus engine load. Listen for the whine to be constant with road speed regardless of engine state. Have a workshop scan for MG1/MG2 resolver DTCs. Check transaxle fluid for metallic particles. If a workshop inspection is possible: On a hoist, check transaxle for leaks at axle seals.

Where to look: Hybrid transaxle, beneath centre of engine bay

Ask the seller

  • “Has the transaxle fluid ever been replaced?”
  • “Has any whining or humming noise been noticed, especially at highway speeds?”
  • “Has the hybrid transaxle or motor-generator ever been inspected or rebuilt?”

06Hybrid battery (NiMH) degradation and end-of-life failure

hybrid2003–2015ElectricalRead the full fault: symptoms, where to look, what to ask the seller

07Electric Power Steering Column Motor Failure

Scan for C1511, C1512, C1516, or C1524 EPS system DTCs in the EPS ECU.hybrid2009–2021Electrical
OccasionalElectrical $850–$2,600 to fix

The Prius employs a column-type electric power steering (C-EPS) system in which an electric motor and torque sensor are mounted directly on the upper steering column shaft, with the motor ECU integrated into the same assembly. The motor windings and brush contacts are subject to failure from heat soak in the dashboard environment and from accumulated operating cycles. Winding faults or ECU failures cause partial or complete loss of steering assist, requiring substantially elevated driver effort at low speeds.

Symptoms to notice

  • EPS warning light (orange steering wheel icon) illuminated on instrument cluster
  • Sudden increase in steering effort required, most noticeable during slow-speed manoeuvring
  • Intermittent loss of power steering that recovers after vehicle restart
  • C1511 or C1516 EPS torque sensor or motor circuit DTCs on scan

What to check

  1. Scan for C1511, C1512, C1516, or C1524 EPS system DTCs in the EPS ECU.
  2. Verify battery voltage is above 12.0 V at rest — low supply voltage can cause false EPS shutdowns.
  3. Check the EPS motor wiring connector at the column for corrosion or damaged pins.
  4. Test steering effort at parking speed with engine running; notchy or excessively heavy steering confirms reduced assist.

Where to look: Upper steering column, behind and beneath the dashboard on the driver's side

Parts involved: Steering rack.

Ask the seller

  • “Has the EPS warning light ever appeared during ownership, and was it diagnosed?”
  • “Has the vehicle ever been subject to a recall inspection related to the electric power steering?”
  • “Is the steering effort consistent and light at low parking speeds?”

08Combination meter (dash display) goes blank

Watch the centre dash display the moment the car is powered on - it should light instantly and completely.hybrid2003–2009ElectricalRead the full fault: symptoms, where to look, what to ask the seller

09Traction Battery Cooling Fan Blockage

Inspect the intake mesh for lint and debris — it should be clear.hybrid2004–2015ElectricalRead the full fault: symptoms, where to look, what to ask the seller

10Headlight Projector UV Discolouration

Inspect both headlight lenses in bright daylight for yellowing, surface hazing, or crazing of the polycarbonate.hybrid2003–2009Electrical
Very commonElectrical $150–$800 to fix

The Gen2 Prius uses projector-type low-beam headlight assemblies with polycarbonate outer lenses and vacuum-metallised silver reflective coatings on the inner projector bowl. The polycarbonate lens carries a factory UV-absorbing hard coat that depletes over time with solar exposure, allowing UV radiation to initiate chain-scission degradation of the polycarbonate matrix, causing yellowing, micro-crazing, and optical scatter at the lens surface. Simultaneously, moisture that ingresses through imperfect housing seals attacks the vacuum-deposited aluminium reflective layer on the projector bowl, causing oxidation, delamination, and localised lifting of the coating. Both degradation pathways independently reduce the headlight's luminous output, with combined effects capable of cutting total light output by 50–70% compared to new condition, which constitutes a road safety hazard and grounds for a New Zealand WOF failure on luminance or beam pattern.

Symptoms to notice

  • Visibly yellowed or frosted headlight outer lens surface in daylight
  • Noticeably dim headlight output at night relative to other vehicles
  • Dull, patchy, or flaking reflective coating visible inside headlight bowl
  • WOF advisory or failure for insufficient headlight light output or beam quality
  • Scattered or poorly defined beam pattern on a flat surface

What to check

Inspect both headlight lenses in bright daylight for yellowing, surface hazing, or crazing of the polycarbonate. Shine a flashlight into the headlight unit through the lens and examine the projector bowl's reflective surface for oxidation patches, bubbling, or delamination. On a test drive, assess headlight projection quality at night — a healthy projector produces a crisp cutoff line; a degraded one shows diffuse scatter.

Where to look: Front headlight assemblies, driver side and passenger side, behind the front bumper fascia

Ask the seller

  • “Have the headlight lenses been professionally polished or UV-recoated?”
  • “Has the vehicle received any WOF advisory notices related to headlight condition?”
  • “Has the car been stored outdoors for most of its life or kept garaged?”

1112V auxiliary battery in the boot - small, weak and often neglected

Lift the boot floor panel on the right side and check the battery's age label and terminals for corrosion.hybrid2003–2015Electrical
Very commonElectrical $300–$650 to fix

Gen 2 and Gen 3 Prius hide a small AGM 12V battery in the right rear corner of the boot. It only boots the computers (it never cranks an engine) so it is small, and when it sags it causes bizarre electrical gremlins: no READY, random warning lights, shift lever faults. Owners and even garages misdiagnose these as hybrid faults. It needs the correct vented AGM type (S46B24R style), which costs more than a normal small battery, and jump-starting it backwards can destroy the inverter.

Symptoms to notice

  • Car intermittently refuses to go to READY
  • Multiple random warning lights that clear after a restart
  • Sluggish boot-up of displays
  • Battery goes flat if car sits 2+ weeks

What to check

  1. Lift the boot floor panel on the right side and check the battery's age label and terminals for corrosion.
  2. Ask the seller to power the car fully off and back on - slow, glitchy start-up suggests a weak 12V.
  3. A voltage check in the diagnostic menu (or with a multimeter at the jump point under the bonnet fuse box) should show 12.4V+ resting.

Where to look: Under the boot floor / right rear corner of the cargo area

Parts involved: 12V battery.

Ask the seller

  • “When was the 12V auxiliary battery last replaced?”
  • “Was it replaced with the correct AGM type?”
Body, brakes, suspension & interior2 critical7

12Brake actuator / accumulator failure (C1256, C1391)

The electro-hydraulic brake unit is one of the two big-ticket failures on Gen 2 and Gen 3 Prius.hybrid2003–2015BrakesRead the full fault: symptoms, where to look, what to ask the seller

13Curtain airbag inflator can split at a weld recall (ZVW30 Prius, 2009-2012)

Ask the seller for the airbag recall paperwork, and check the VIN with a Toyota dealer or the government recall check before you buy.hybrid2009–2012Interior
OccasionalInterior $0 to fix

ZVW30 Prius (1.8 hybrid) built from April 2009 to April 2012 were recalled because the curtain shield airbag inflator chambers can separate due to weld cracks. If that happens the curtain airbag may not deploy properly and parts can be thrown into the cabin in a side impact. Toyota Australia recall PRA 2016/15480 replaces the inflators for free. The Australian recall lists export VINs (JTDKN36U). Most NZ Prius are Japanese imports with ZVW30 chassis numbers, so ask a Toyota NZ dealer to check the chassis number.

Symptoms to notice

  • No symptom in normal use
  • Airbag warning light may come on

What to check

  1. Ask the seller for the airbag recall paperwork, and check the VIN with a Toyota dealer or the government recall check before you buy.
  2. Look for a recall completion sticker in the door jamb or under the bonnet, and check the airbag warning light comes on at start up then goes out.
  3. If a workshop inspection is possible: a Toyota dealer can confirm by VIN whether the replacement inflator has been fitted.

Where to look: Curtain airbags along the roof rails

Ask the seller

  • “Has the airbag recall been done, and do you have the dealer paperwork?”
  • “Has the car been checked by VIN for any open recalls?”

14Rear Torsion Beam Axle Corrosion

The ZVW30 Prius uses a torsion beam rear suspension.hybrid2009–2015Body & Rust
OccasionalBody & Rust $1,100–$3,200 to fix

The ZVW30 Prius uses a torsion beam rear suspension. In NZ and AU coastal environments, and on roads treated with magnesium chloride or sodium chloride, the hollow torsion beam and its brackets accumulate moisture and corrode from the inside outward. Affected areas include the beam cross-section, trailing arm pivot brackets, and lateral link mounting points on the body. At advanced stages, corrosion perforates the beam or weakens the body mounting points to the point of structural failure risk. NZ import units sourced from Hokkaido or Tohoku regions of Japan are particularly susceptible due to prior salt-road exposure. Repair typically requires beam replacement; severe body-mount corrosion requires panel patching or section replacement.

Symptoms to notice

  • Visible surface rust on underside of rear axle beam
  • Flaking or bubbling paint on rear beam or trailing arm brackets
  • Rear suspension clunking over bumps or uneven load
  • Abnormal tyre wear at rear axle
  • Squeaking from rear suspension when loaded

What to check

  1. Inspect the full underside of the rear torsion beam with a torch — check the central cross-member, both trailing arm sections, and body mounting brackets for perforation or structural section loss.
  2. Probe suspicious areas with a screwdriver to test for soft corroded metal.
  3. Check inner wheel arch for rust bleed through the body-to-beam mounting bolts.
  4. Review vehicle import history for prior Japanese region if possible.

Where to look: Rear suspension torsion beam axle and body mounting brackets, underside of vehicle between rear wheels

Parts involved: Body corrosion.

Ask the seller

  • “Where was this vehicle imported from in Japan and what region was it registered in?”
  • “Has the underbody ever been rust-proofed or treated since import?”
  • “Has the rear axle or any rear suspension components been replaced?”

15Rear Caliper Slide Pin Seizure – Brake Drag

The Prius Gen2 uses regenerative braking as its primary deceleration mechanism for all normal urban and suburban driving.hybrid2003–2009BrakesRead the full fault: symptoms, where to look, what to ask the seller

16Front Lower Control Arm Ball Joint Wear

Inspect the ball joint rubber boot for splits, grease loss, or contamination.hybrid2009–2021Suspension
CommonSuspension $320–$720 to fix

The Prius front MacPherson strut suspension uses a pressed lower ball joint integrated into the lower control arm. The ball joint stud rotates and articulates under combined steering and suspension load cycles, and the grease-for-life seal progressively deteriorates, accelerating wear in the socket. As radial and axial play increases, dynamic toe and camber angles shift beyond specification under braking and cornering loads, degrading tyre wear and steering response. In advanced failure, the taper-fit stud can pull free of the steering knuckle, resulting in sudden and complete loss of directional control.

The front wheel of a car splayed outward with the lower control arm hanging down after a ball joint separation.Example of the part — not this vehicle

A separated lower ball joint: the control arm has dropped and the wheel has splayed out under the guard.

Elfix · CC0 · Wikimedia Commons

Symptoms to notice

  • Clunking or knocking from front suspension when traversing potholes or speed bumps
  • Feathered or one-sided front tyre wear inconsistent with wheel alignment records
  • Vague or wandering steering feel, particularly under braking
  • Front wheel alignment unable to be brought to specification during routine service

What to check

  1. Inspect the ball joint rubber boot for splits, grease loss, or contamination.
  2. Check for corrosion at the stud taper in the steering knuckle.
  3. Verify front wheel alignment is within specification after any suspension inspection.
  4. If a workshop inspection is possible: With vehicle raised on a hoist, grasp each front tyre at the 6 and 12 o'clock positions and apply vertical force — measurable play or knock indicates ball joint failure.

Where to look: Front lower control arm, one per side, connecting arm to steering knuckle

Parts involved: Ball joint.

Ask the seller

  • “Have the front lower control arms or ball joints been replaced, and at what mileage?”
  • “Has the vehicle had a wheel alignment performed recently, and were any suspension components noted as worn?”
  • “Is there any audible knock from the front suspension over bumps?”

17Brake Caliper Guide Pin Seizure

Inspect guide pin rubber boots for tears, splits, or dislodgement from their grooves.hybrid2009–2021Brakes
CommonBrakes $160–$420 to fix

The Prius front and rear disc brake calipers are sliding-pin type, relying on two hardened steel guide pins per caliper to allow the caliper body to translate laterally as brake pads wear and thermal expansion occurs. Each guide pin operates within a rubber boot to exclude moisture; when these boots crack or dislodge, road moisture and salt penetrate the anodised pin bore and cause corrosion-induced seizure. A seized caliper cannot retract fully after brake application, maintaining residual pad-to-rotor contact that generates drag heat, accelerates pad and rotor wear asymmetrically, and in severe cases raises brake fluid temperature sufficiently to degrade pedal feel.

Symptoms to notice

  • Inner brake pad worn significantly beyond the outer pad on the same corner
  • Vehicle pulling to one side under moderate brake application
  • Brake drag causing one wheel to run hotter than others, detectable by heat after a short drive
  • Grinding, squealing, or premature brake wear returning shortly after a brake service

What to check

  1. Inspect guide pin rubber boots for tears, splits, or dislodgement from their grooves.
  2. Compare inner and outer brake pad thickness on each corner; a difference greater than 3 mm indicates caliper sliding failure.
  3. Inspect rotor surfaces for heat-blued discolouration on the seized side.
  4. If a workshop inspection is possible: Remove each caliper and withdraw both guide pins by hand — each pin should slide freely through its full travel without force or binding.

Where to look: Front and rear sliding-pin brake calipers, both sides of each axle

Parts involved: Brake disc and pads.

Ask the seller

  • “When were the brakes last serviced, and were the caliper guide pins cleaned and regreased at that service?”
  • “Has the vehicle ever pulled to one side under braking?”
  • “Are the front and rear brake pads showing even wear across the inner and outer faces?”

18Rear Torsion Beam Pivot Bush Collapse

Inspect the rear beam-to-chassis pivot bushes visually for cracking, rubber separation, or metallic contact between the beam and bracket.hybrid2009–2021Suspension
CommonSuspension $420–$900 to fix

The Prius rear suspension uses a torsion beam (twist beam) axle geometry, with large rubber-bonded pivot bushes where the beam attaches to the body-side brackets. These natural-rubber bushes harden, crack, and eventually separate from their steel inner sleeves due to heat cycling, UV degradation, and sustained torsional loading over high mileage. Collapsed bushes permit longitudinal and lateral movement of the entire rear axle relative to the chassis, shifting rear wheel camber and toe angles out of specification. This produces abnormal tyre wear patterns and degrades straight-line tracking stability.

Symptoms to notice

  • Accelerated inner or outer rear tyre edge wear not correctable by tyre rotation
  • Thumping or knocking from rear suspension over road irregularities
  • Vehicle requires continuous small steering corrections to maintain straight-line travel
  • Rear wheel alignment outside specification despite no prior impact damage

What to check

  1. Inspect the rear beam-to-chassis pivot bushes visually for cracking, rubber separation, or metallic contact between the beam and bracket.
  2. Attempt to move the rear beam by hand in the longitudinal direction with the vehicle raised — any perceptible movement confirms bush failure.
  3. Check rear wheel camber and toe angles at a wheel alignment station; angles outside Toyota specification indicate bush collapse even if bushes appear intact.

Where to look: Rear torsion beam pivot brackets, both sides at chassis mounting points

Ask the seller

  • “Have the rear suspension pivot bushes ever been inspected or replaced?”
  • “Has the vehicle had a four-wheel alignment, and were any rear alignment angles noted as out of specification?”
  • “Is there any knocking sound from the rear of the vehicle over bumps?”
Depends on the exact engine — 5 moreDocumented for a specific engine we could not confirm from what you picked. Check the engine code on the car.
Engine, transmission & cooling4

01Head gasket failure driven by EGR system carbon clogging (1.8 2ZR-FXE)

Insist on a stone-cold start - put your hand on the bonnet first to check it hasn't been warmed up.hybrid2009–2015EngineRead the full fault: symptoms, where to look, what to ask the seller

02Head Gasket Failure — 1NZ-FXE

Remove oil filler cap and inspect underside for white or brown emulsion.hybrid2003–2009EngineRead the full fault: symptoms, where to look, what to ask the seller

03Electric Water Pump Impeller Erosion – Overheating

Ask whether the electric water pump has ever been replaced, and look for a pump invoice in the service history.hybrid2009–2015CoolingRead the full fault: symptoms, where to look, what to ask the seller

04Excessive Engine Oil Consumption — 2ZR-FXE

Check engine oil on dipstick and note level relative to last service.hybrid2009–2022EngineRead the full fault: symptoms, where to look, what to ask the seller
Fluid leaks1

01Fuel tank suction plate can crack and leak fuel recall (ZVW30 Prius, 2009-2015)

Ask for the fuel tank recall paperwork and check the VIN with a Toyota dealer.hybrid2009–2015Fluid Leaks
OccasionalFluid Leaks $0–$600 to fix

Can't confirm for this car

The ZVW30 Prius (1.8 2ZR-FXE hybrid, 2009-2015) was recalled because the fuel suction plate on top of the fuel tank can crack and, over time, leak fuel when the tank is full, which is a fire risk. Toyota Australia recall PRA 2016/15491 covers cars built from April 2009 to February 2015, nearly the whole generation, and replaces the part for free. The Australian recall lists export VINs (JTDKN36U). Most NZ Prius are Japanese imports with ZVW30 chassis numbers, so ask a Toyota NZ dealer to check the chassis number.

Symptoms to notice

  • Fuel smell around the rear seat or under the car, worst after filling up
  • Fuel drip under the rear of the car

What to check

  1. Ask for the fuel tank recall paperwork and check the VIN with a Toyota dealer.
  2. Smell inside the cabin and around the rear of the car, ideally just after the tank has been filled, and look under the rear for fuel drips.
  3. If a workshop inspection is possible: the fuel pump access cover under the rear seat can be removed to inspect the suction plate for cracks or fuel weeping.

Where to look: Top of the fuel tank, under the rear seat

Ask the seller

  • “Has the fuel tank suction plate recall been done?”
Other Toyota Prius engines and years19 documented issues that do not apply to the one you picked.
Engine, transmission & cooling7

01MG2 Resolver Fault P3190 Hybrid Transaxle Failure

Scan hybrid ECU for DTCs P3190 and P3105 using a Toyota-capable scanner.hybrid2011–2017Transmission
OccasionalTransmission $3,500–$8,500 to fix

Does not apply

The Motor Generator No.2 (MG2) resolver in the ZVW40 hybrid transaxle provides rotor position and speed feedback to the Power Management Control ECU. When resolver windings or signal circuits degrade from thermal cycling at high mileage, the hybrid system loses accurate drive motor data and triggers DTC P3190 (and commonly P3105). The vehicle enters failsafe — the Ready indicator will not illuminate and the car cannot be driven. Resolver degradation is caused by insulation breakdown in the transaxle winding over sustained heat cycling and is not field-repairable; the transaxle requires overhaul or replacement. Most presentations occur beyond 120,000 km on grey import ZVW40 units.

Symptoms to notice

  • Red hybrid system warning triangle illuminated on dash
  • Ready indicator fails to illuminate after pressing power button
  • DTC P3190 or P3105 stored in hybrid system ECU
  • Vehicle will not enter drive mode — completely immobilised
  • Intermittent traction power loss before full failsafe lockout

What to check

  1. Scan hybrid ECU for DTCs P3190 and P3105 using a Toyota-capable scanner.
  2. Check transaxle resolver harness connector under centre console for corrosion or pushed pins.
  3. Note odometer — resolver faults concentrate above 120,000 km.
  4. Request full hybrid ECU freeze-frame data from the seller before purchase.

Where to look: MG2 resolver winding internal to hybrid transaxle assembly, centre of vehicle beneath floor tunnel

Ask the seller

  • “Has the vehicle ever shown a red hybrid system warning triangle on the dash?”
  • “Has any hybrid or traction system DTC ever been stored or cleared?”
  • “What is the full service history of the transaxle and hybrid system?”

02MG2 Resolver Fault P315A at High Mileage

Review freeze-frame data for mileage and load conditions at fault onset.hybrid2015 onwardTransmission
OccasionalTransmission $2,000–$5,500 to fix

Does not apply

The ZVW50 Prius transaxle uses a variable-reluctance resolver mounted on MG2 (Motor Generator 2, the primary traction motor) to report rotor position to the hybrid ECU at all times. At high mileage, typically above 180,000 km, the resolver winding insulation degrades or the reluctor target becomes contaminated with metallic debris from gear wear, causing intermittent or permanent signal loss. The hybrid ECU detects the position fault and stores P315A (Motor/Generator Speed Sensor 2 Circuit Range/Performance), entering limp mode or refusing to enter Ready mode. Repair requires transaxle removal and MG2 resolver replacement or full transaxle overhaul. Some independent hybrid specialists in NZ/AU can perform resolver replacement without full transaxle replacement.

Symptoms to notice

  • P315A DTC stored — Motor Generator Speed Sensor 2 fault
  • Hybrid system warning with forced limp or no-Ready condition
  • Intermittent loss of drive power under acceleration
  • Triangle warning and red exclamation simultaneously
  • Fault clears temporarily after restart but returns under load

What to check

  1. Review freeze-frame data for mileage and load conditions at fault onset.
  2. Check transaxle fluid for metallic contamination or discolouration indicating internal wear.
  3. Verify resolver signal quality using oscilloscope on resolver signal wires if accessible — look for missing pulses or noise at elevated temperature.
  4. If a workshop inspection is possible: Connect Toyota Techstream or compatible OBD scanner and check for P315A, P314A, and related MG resolver codes.

Where to look: MG2 resolver inside the P410 transaxle unit, accessible only after transaxle removal from vehicle

Ask the seller

  • “Has the car ever shown a hybrid system warning or entered limp mode?”
  • “Has a full hybrid system scan been done at a Toyota dealer or hybrid specialist recently?”
  • “What is the transaxle fluid history — has it ever been changed?”
  • “Has any work been done on the transaxle or drivetrain?”

03PHV/Prime HV Battery Liquid Cooling Pump Failure (ZVW52)

Check for DTCs P0A7C (battery cooling system) or P0A1F.hybrid2017–2022Cooling
OccasionalCooling $900–$2,800 to fix

Does not apply

The second-generation Prius PHV (ZVW52 Prime, 2017–2022) introduced a liquid thermal management system for the enlarged 8.8 kWh lithium-ion traction battery, replacing the air cooling of earlier PHV models. The dedicated battery coolant pump and associated circulation circuit can fail due to seal degradation and pump motor wear. Failure causes the HV battery to overheat during charging or sustained EV operation, forcing the system to limit charge acceptance and cut EV output prematurely. Prolonged operation with a failed cooling pump accelerates irreversible lithium cell capacity loss. This is a separate circuit from the inverter cooling loop.

Symptoms to notice

  • EV range drops sharply after only partial use of a full charge on warm days
  • HV battery temperature reading elevated (above 40°C) during normal driving logged via OBD
  • DTC P0A7C or P0A1F — HV battery cooling system performance
  • Amber HV system warning with reduced EV output in warm weather only
  • Coolant loss from battery cooling reservoir without visible external leak

What to check

  1. Check for DTCs P0A7C (battery cooling system) or P0A1F.
  2. Inspect the battery coolant reservoir under the boot floor for correct level and absence of discolouration.
  3. If a workshop inspection is possible: Use Toyota Techstream or a compatible OBD-II scanner to monitor HV battery temperature during a charge session and during the first 10 km of EV driving — temperature should remain below 35°C in ambient conditions below 25°C.

Where to look: Under boot floor/rear seat — HV battery cooling pump and reservoir integrated with the lithium battery module assembly

Parts involved: Water pump.

Ask the seller

  • “Has the car ever limited EV performance or shown warnings specifically on hot days?”
  • “Has the HV battery cooling system or its pump been inspected or replaced?”
  • “Can you show a live OBD reading of HV battery temperature during a short test drive?”

04A25A-FXS Intake Valve Carbon Buildup

Look for brown-black carbon deposits on the back face of intake valves and intake port walls.hybrid2015 onwardEngineRead the full fault: symptoms, where to look, what to ask the seller

05Denso low-pressure fuel pump recall (engine stall)

Run the VIN through Toyota NZ's recall checker (toyota.co.nz/owners/recall) or ask a dealer.hybrid2018–2020Engine
OccasionalEngine $0–$1,200 to fix

Does not apply

The XW50 Prius is among the many 2018-2020 Toyotas caught by the huge Denso fuel pump recall: the pump impeller can swell and stop, causing rough running or a sudden stall with no restart. Toyota Australia and Toyota NZ ran VIN-based recalls with free pump replacement. Most cars are done, but JDM-imported examples can slip through, so a VIN check with Toyota NZ is essential.

Symptoms to notice

  • Engine cranks but won't start
  • Rough running or hesitation under load before failure
  • Sudden stall while driving

What to check

Run the VIN through Toyota NZ's recall checker (toyota.co.nz/owners/recall) or ask a dealer. If the recall shows outstanding, require it to be completed before purchase - it is free at any Toyota dealer.

Where to look: Fuel pump inside the fuel tank, under the rear seat

Parts involved: Water pump.

Ask the seller

  • “Has the fuel pump recall been completed on this VIN?”
  • “Has the car ever stalled or refused to start?”

06Engine Coolant Pump Seal Failure Causing Coolant Loss

Check the coolant reservoir level against the cold-fill mark and request service records showing coolant top-up history.hybrid2011–2017Cooling
OccasionalCooling $500–$1,100 to fix

Does not apply

The 2ZR-FXE engine uses an electrically driven primary coolant pump rather than a belt-driven mechanical pump. The pump motor shaft seal and impeller housing O-ring degrade through repeated thermal cycling, typically presenting at 100,000 km and beyond. Seal failure causes progressive coolant loss that may not produce an immediately visible puddle but steadily depletes the reservoir. In advanced cases coolant contacts pump motor windings, causing pump failure and rapid engine overtemperature. The hybrid ECU can mask early overtemperature events by reducing engine duty cycle, making the fault insidious. Coolant loss also risks air ingestion into the inverter cooling circuit on vehicles where both circuits share a common header tank without adequate isolation.

Symptoms to notice

  • Coolant reservoir level dropping between services with no visible external puddle
  • Sweet coolant smell from engine bay after sustained driving
  • Engine temperature gauge reading above normal operating range
  • Coolant warning light or hybrid system caution indicator illuminated
  • Dried coolant residue or staining around the electric pump housing on engine block

What to check

  1. Check the coolant reservoir level against the cold-fill mark and request service records showing coolant top-up history.
  2. If a workshop inspection is possible: Pressure-test the cooling circuit to 110 kPa — a healthy system holds pressure for 10 minutes with no measurable drop.
  3. Remove the engine undertray and inspect the electric coolant pump body for residue staining or active seepage around the shaft seal face.

Where to look: Electric engine coolant pump mounted on the front face of the 2ZR-FXE engine block, accessible from above with undertray removed

Parts involved: Water pump.

Ask the seller

  • “Has the coolant ever needed topping up between scheduled services?”
  • “Has the electric coolant pump been inspected or replaced?”
  • “What coolant type and concentration is currently in the system?”

07Inverter Coolant Pump Bearing Failure & Overtemperature

hybrid2011–2017Cooling
OccasionalCooling $350–$800 to fix

Does not apply

The ZVW40 hybrid inverter and boost converter assembly is cooled by a dedicated electric water pump that is entirely separate from the engine cooling circuit. The pump motor bearing degrades with age and mileage, initially producing a high-pitched whine or grinding from the engine bay at startup. As bearing wear progresses the pump flow rate drops below the threshold required to maintain inverter junction temperatures within design limits. The hybrid system triggers DTC P0A93 (Inverter Cooling System Performance) and enters reduced-power or no-drive failsafe mode to prevent inverter damage. Complete bearing seizure causes immediate hybrid shutdown with no warning. Failures are most likely during sustained motorway driving or in summer ambient temperatures where inverter heat rejection demand is highest.

Symptoms to notice

  • High-pitched whine or grinding noise from inverter area of engine bay at startup
  • DTC P0A93 — Inverter Cooling System Performance stored in hybrid ECU
  • Hybrid system warning light with simultaneous entry into reduced power mode
  • Inverter coolant reservoir level dropping without visible external leak
  • System entering no-drive failsafe during warm weather or sustained motorway use

What to check

With ignition switched to On but not Ready, listen for the inverter pump priming cycle — a healthy pump runs audibly but quietly for approximately 90 seconds then stops. Any grinding, rattling, or absence of pump operation is abnormal. Scan the hybrid ECU for P0A93. Inspect the separate inverter coolant reservoir for correct level and absence of contamination or discolouration.

Where to look: Inverter electric coolant pump mounted at front of engine bay adjacent to the hybrid inverter/converter assembly on the driver side

Parts involved: Water pump.

Ask the seller

  • “Has a P0A93 or any inverter cooling fault code ever been diagnosed?”
  • “Has the inverter coolant pump been replaced or inspected?”
  • “Has the vehicle ever entered a reduced-power or no-drive state while driving?”
Electrical6

01Engine wire harness can rub through at the power control unit, fire risk recall (ZVW50 Prius, 2016-2018)

Ask for the wire harness recall (LGG58) paperwork and check the VIN with a Toyota dealer.hybrid2016–2018Electrical
OccasionalElectrical $0 to fix

Does not apply

ZVW50 Prius (1.8 hybrid) sold from November 2015 to May 2018 were recalled because the engine wire harness connected to the hybrid power control unit can rub against a connector cover and wear through. That can short circuit, set warning lights, and in the worst case start a fire. Toyota Australia campaign LGG58 fixes this for free at a dealer. Most NZ ZVW50 Prius are Japanese imports, so ask a Toyota NZ dealer to check the chassis number for this recall.

Symptoms to notice

  • Warning lights on the dash
  • Car will not go into READY mode
  • Burning smell from the engine bay

What to check

  1. Ask for the wire harness recall (LGG58) paperwork and check the VIN with a Toyota dealer.
  2. Look under the bonnet for scorch marks or melted insulation around the power control unit and check that no warning lights are on.
  3. If a workshop inspection is possible: the harness at the power control unit cover can be inspected for chafing.

Where to look: Engine bay, wire harness at the hybrid power control unit

Ask the seller

  • “Has the LGG58 wire harness recall been done?”

02PHV Lithium-Ion Traction Battery Capacity Degradation

Check EV RANGE readout on MID after a full charge — should show at least 20 km (ZVW35) or 35 km (ZVW52 Prime).hybrid2012–2022ElectricalRead the full fault: symptoms, where to look, what to ask the seller

03Onboard Charger (OBC) AC Input Relay or IGBT Failure

Plug the car into a working EVSE/charge point and confirm the charge indicator light activates within 30 seconds.hybrid2012–2022Electrical
OccasionalElectrical $1,800–$4,500 to fix

Does not apply

The ZVW35 and ZVW52 onboard AC-to-DC charger contains an AC input relay and IGBT bridge that can fail due to thermal cycling stress and relay contact welding. Failure modes range from total charging refusal (car plugged in but charge lamp does not illuminate) to intermittent charging sessions that abort mid-cycle. Toyota issued service guidance and some owners have had OBC units replaced under extended warranty in markets where lemon-law provisions apply. Third-party repair of the IGBT module is possible but requires specialist EV electronics knowledge.

Symptoms to notice

  • Charge indicator lamp fails to illuminate after plugging into a working charge point
  • Charging session starts then stops within minutes with no fault displayed
  • DTC P0D3A or P0D5B stored in EV/HV system
  • Burning smell near charger unit after attempted charge
  • Charger body or connector housing shows heat discolouration

What to check

  1. Plug the car into a working EVSE/charge point and confirm the charge indicator light activates within 30 seconds.
  2. Check for DTCs P0D3A (OBC malfunction) and P0D5B (AC relay circuit).
  3. Inspect the OBC unit under the bonnet (ZVW35) or in the engine bay near the left strut tower (ZVW52) for signs of heat scorching or melted connector housing.

Where to look: Engine bay — onboard charger mounted near left strut tower (ZVW52) or behind the headlight assembly (ZVW35)

Ask the seller

  • “Does the car charge correctly from a standard 10 A household outlet and a Type 2 EVSE?”
  • “Has the onboard charger or charge port assembly ever been replaced?”
  • “Are there any stored fault codes related to the charging system?”

04ZVW50 Inverter Electric Water Pump Failure

With ignition switched on, listen for the electric water pump audible hum from the engine bay — absence suggests pump failure.hybrid2015–2021ElectricalRead the full fault: symptoms, where to look, what to ask the seller

0512V Auxiliary Battery Drain Causing Hybrid Lockout

Check the manufacture date label on the battery case; any battery older than 4 years should be replaced before purchase.hybrid2011–2017Electrical
CommonElectrical $200–$450 to fix

Does not apply

The ZVW40 Prius V relies on a 12V lead-acid auxiliary battery to power the hybrid system control ECUs, accessory bus, and the initialisation relay circuit. Unlike a conventional vehicle, the HV traction battery cannot bootstrap the 12V system once the auxiliary battery is fully discharged. A failed or deeply sulphated 12V battery causes complete hybrid lockout — the system will not enter Ready mode and all warning indicators illuminate simultaneously. The auxiliary battery charges less aggressively than in a conventional vehicle because engine run time is minimised, accelerating sulphation. Battery lifespan in NZ grey import units typically ranges from 3 to 5 years. The battery sits in the rear cargo floor compartment, easily accessed but the degradation is not detectable without load testing.

Symptoms to notice

  • Vehicle will not enter Ready mode despite pressing power button
  • Multiple warning lights illuminate simultaneously at startup
  • Remote key fob unresponsive even with fresh fob battery
  • Audible relay clicking with no Ready state achieved
  • 12V battery voltage below 11.5V under load test

What to check

  1. Check the manufacture date label on the battery case; any battery older than 4 years should be replaced before purchase.
  2. Inspect both terminals for corrosion.
  3. Ask the seller for any history of flat-battery events or extended vehicle storage periods.
  4. If a workshop inspection is possible: Load-test the 12V auxiliary battery in the rear cargo floor — a resting voltage above 12V does not confirm serviceability.

Where to look: Rear cargo area under floor access panel on the driver side of the luggage compartment

Parts involved: 12V battery.

Ask the seller

  • “When was the 12V auxiliary battery last replaced?”
  • “Has the car ever failed to enter Ready mode or required a jump start?”
  • “Has the vehicle sat unused for more than 2 weeks at any point?”

06Recall: reversing / Panoramic View Monitor camera can freeze or go blank (XW60, campaign 25V744)

hybrid2023 onwardElectrical
OccasionalElectrical

Does not apply

The 5th-generation XW60 Prius is part of a large 2022-2026 Toyota and Lexus recall (NHTSA 25V744) in which a Parking Assist ECU software error can make the reversing-camera image freeze on an old frame or show a blank screen when reverse is selected. Losing the rear view raises the risk of hitting something or someone while backing. The remedy is a free parking-assist software update, so confirm it was applied. This is separate from the earlier XW60 rear-door-switch recall.

Symptoms to notice

  • Reversing-camera image frozen on a previous frame
  • Blank or black screen when you shift into reverse
  • Camera image appears only intermittently

What to check

With the engine on, shift into reverse several times and watch the centre screen: a live camera image should appear immediately each time, not freeze or stay black. Ask a Toyota dealer to confirm via the VIN that recall 25V744 (parking-assist software update) has been completed.

Where to look: Rear-view camera and Parking Assist ECU; image is shown on the centre display

Ask the seller

  • “Has the reversing-camera software recall (25V744) been carried out on this car?”
  • “Does the reversing camera ever freeze or go black when you select reverse?”
Body, brakes, suspension & interior6

01Brake Booster Pump / ABS Actuator Assembly Failure

The Prius uses an electro-hydraulic brake booster (brake actuator assembly) to blend regenerative and friction braking.hybrid2010–2015Brakes
OccasionalBrakes $1,600–$3,800 to fix

Does not apply

The Prius uses an electro-hydraulic brake booster (brake actuator assembly) to blend regenerative and friction braking. The actuator pump motor is known to fail, producing a loud groaning or whining noise when braking and triggering multiple warning lights simultaneously — ABS, brake system, and VSC. In severe cases brake boost is lost and stopping distances increase significantly. Later PHV variants share similar actuator architecture and exhibit the same failure mode from the pump motor brushes and accumulator o-rings.

Symptoms to notice

  • Loud groaning or whining from the engine bay during brake pedal application
  • ABS, brake system, and VSC warning lights illuminate simultaneously
  • Brake pedal feels harder than normal (reduced hydraulic assist)
  • DTC C1256 or C1391 stored — brake actuator motor or pressure sensor fault
  • Brake fluid level drops below minimum without visible external leak

What to check

  1. With the car stationary and in READY mode, pump the brake pedal several times and listen for any groaning, whining, or motor noise from beneath the bonnet.
  2. Check for ABS/VSC/brake warning lights.
  3. Inspect the brake actuator assembly on the left side of the engine bay for brake fluid leaks, staining, or corrosion on the housing.
  4. Scan for DTCs C1256 or C1391 which indicate actuator pump motor faults.

Where to look: Engine bay — brake actuator assembly mounted on the left (driver's side on RHD) inner guard

Ask the seller

  • “Have any brake, ABS, or VSC warning lights appeared on the dashboard?”
  • “Has there been any unusual noise from the engine bay during braking?”
  • “Has the brake actuator assembly ever been replaced or repaired on this vehicle?”

02Brake booster pump recall (April-June 2019 builds)

Check the build date on the door jamb plate; if it falls in the recall window, verify recall completion via Toyota NZ with the VIN before purchase.hybrid2019Brakes
RareBrakes $0–$2,500 to fix

Does not apply

Prius models built between late April and early June 2019 were recalled because the brake booster pump can stop working, deactivating stability control and increasing pedal effort. Dealers inspected and replaced the pump free of charge from September 2019. A narrow window, but worth a VIN check on any 2019 car, especially a JDM import that may have missed the campaign.

Symptoms to notice

  • Hard brake pedal / increased effort
  • ABS, VSC and brake warning lights on together

What to check

Check the build date on the door jamb plate; if it falls in the recall window, verify recall completion via Toyota NZ with the VIN before purchase.

Where to look: Brake booster pump assembly in the engine bay

Ask the seller

  • “Has the 2019 brake booster pump recall been verified as done on this VIN?”

03Rear door latch recall - doors can open while driving (XW60, early builds)

Verify the rear door handle recall is completed via a Toyota NZ VIN check.hybrid2023 onwardBody & Rust
RareBody & Rust $0–$800 to fix

Does not apply

The new-shape XW60 Prius (2.0 hybrid) had a 2024 global recall because water can enter the rear door handle switches, short them, and allow a rear door to unlatch while driving if the door was not fully closed. Toyota replaced the rear door handle assemblies and applied a software fix free of charge. The XW60 is otherwise too new to have an established fault record; treat any early build as recall-check-required rather than fault-prone.

Symptoms to notice

  • Door ajar warning while driving
  • Rear door not latching firmly
  • Water ingress around rear door handles

What to check

  1. Verify the rear door handle recall is completed via a Toyota NZ VIN check.
  2. Open and close both rear doors firmly and check the door-ajar warning behaves correctly.

Where to look: Rear door handles and latch assemblies

Ask the seller

  • “Has the rear door latch/handle recall been completed?”
  • “Is there any remaining new-vehicle and hybrid battery warranty, and is it transferable?”

04Windscreen stress cracking (XW50)

hybrid2015–2022Body & Rust
OccasionalBody & Rust $600–$1,500 to fix

Does not apply

The Gen 4 Prius has a widely reported issue with the windscreen cracking spontaneously or from very minor stone strikes, attributed to the thin glass and body flex around the steeply raked screen. It is a nuisance rather than a mechanical danger, but replacement glass with the camera/rain sensor recalibration is not cheap and insurance excesses apply. Otherwise the XW50 is regarded as the most reliable Prius generation.

Symptoms to notice

  • Long crack spreading from the edge of the windscreen with little or no impact mark
  • Previous windscreen replacement in the car's history

What to check

Check the screen edge-to-edge in good light for chips and repaired cracks, and check whether the glass is original Toyota branded or aftermarket (aftermarket = already replaced once). If the car has Toyota Safety Sense, ask whether the camera was recalibrated after any glass replacement.

Where to look: Front windscreen, cracks typically starting at the edges

Ask the seller

  • “Has the windscreen ever been replaced?”
  • “Was the safety camera recalibrated after replacement?”

05Front Lower Arm Inner Bush Failure Steering Pull

Inspect the bush rubber face visually for cracking, extrusion beyond the metal sleeve, or visible separation.hybrid2011–2017Suspension
CommonSuspension $380–$900 to fix

Does not apply

The ZVW40 front suspension lower control arm uses pressed-in rubber-to-metal inner pivot bushes at both the front and rear inboard mounts. The front inner bush is most susceptible to rubber compound separation from the metal sleeve under the combination of NZ road conditions and the relatively light steering loads typical of hybrid urban driving. Once the rubber-to-metal bond fails, the bush allows fore-aft movement of the lower arm pivot, changing front wheel alignment geometry dynamically under cornering and braking loads. Drivers experience a persistent directional pull, steering vibration at 80-110 km/h, and a clunk over transverse road seams. Because the bush is pressed into a cast aluminium arm, replacement typically requires a hydraulic press and most independent workshops replace the complete arm rather than pressing a new bush.

The front wheel of a car splayed outward with the lower control arm hanging down after a ball joint separation.Example of the part — not this vehicle

A separated lower ball joint: the control arm has dropped and the wheel has splayed out under the guard.

Elfix · CC0 · Wikimedia Commons

Symptoms to notice

  • Persistent steering pull to one side not resolved by wheel alignment adjustment
  • Steering wheel vibration felt between 80 and 110 km/h
  • Clunking from front suspension area over potholes or transverse road joints
  • Rapid or uneven front tyre wear after a recent wheel alignment
  • Front alignment angles drifting outside Toyota specification on recheck within months

What to check

  1. Inspect the bush rubber face visually for cracking, extrusion beyond the metal sleeve, or visible separation.
  2. Request a printed alignment report and check castor deviation between sides — asymmetric castor with an otherwise sound vehicle points to inner bush collapse.
  3. If a workshop inspection is possible: With the vehicle on a hoist, grip each front lower arm firmly and attempt to move it fore and aft in the pivot direction — any movement beyond 2 mm indicates failed inner bush rubber.

Where to look: Front lower control arm inner pivot bush at both front corners, inboard end of arm where it mounts to front subframe

Parts involved: Ball joint.

Ask the seller

  • “Has a wheel alignment been performed in the past 12 months and did the angles hold on recheck?”
  • “Have the front lower control arm bushes or arms been inspected or replaced?”
  • “Is there any clunking, pulling, or vibration from the front suspension when driving?”

06Rear Hatch Gas Strut Failure Causing Tailgate Drop

Open the rear tailgate to full upright position and release — it must hold position without assistance.hybrid2011–2017Body & Rust
CommonBody & Rust $160–$380 to fix

Does not apply

The ZVW40 Prius V rear liftgate is supported by two nitrogen gas struts mounted between the D-pillar and the inner hatch panel. Strut nitrogen pressure decays with age, particularly in high-UV and coastal salt-air environments common across New Zealand. Failed struts allow the heavy rear hatch to fall under its own weight when released, creating a direct head-strike and soft-tissue injury hazard to anyone loading the vehicle. Failure is progressive — early signs include the tailgate needing to be pushed to maintain full-open position, advancing to an immediate drop on release from any angle. Strut cylinder bodies also develop surface corrosion in NZ conditions, accelerating piston seal failure. This fault is extremely common on vehicles over 7 years old and is a routine WOF advisory finding.

Symptoms to notice

  • Rear tailgate will not stay open without being held
  • Tailgate drops slowly or suddenly when released at full-open position
  • Resistance felt when trying to hold the tailgate above the strut equilibrium point
  • Visible surface corrosion or oily film weeping from strut cylinder body

What to check

  1. Open the rear tailgate to full upright position and release — it must hold position without assistance.
  2. Apply light downward pressure and observe if it drops.
  3. Inspect both strut bodies along the cylinder for corrosion pitting or oil film seepage from the piston seal.
  4. Confirm both ball socket ends click securely into their body and hatch mounts.

Where to look: Pair of gas struts, one each side, between rear D-pillar body mounting and rear liftgate inner panel

Parts involved: Shock absorber / strut.

Ask the seller

  • “Does the rear tailgate stay open fully without being held?”
  • “Have the rear hatch gas struts ever been replaced?”
  • “Has the vehicle been stored or regularly used near the coast?”

Toyota Prius faults in detail

Narrowed to the Toyota Prius · 2009. Each of these has its own page: the symptoms, where to look, what to ask the seller and what the repair costs. Free, no account needed.

Brake actuator / accumulator failure (C1256, C1391)Critical · BrakesCombination meter (dash display) goes blankMajor · ElectricalElectric Water Pump Impeller Erosion – OverheatingCritical · CoolingExcessive Engine Oil Consumption — 2ZR-FXEMajor · EngineHead Gasket Failure — 1NZ-FXECritical · EngineHead gasket failure driven by EGR system carbon clogging (1.8 2ZR-FXE)Critical · EngineHybrid battery (NiMH) degradation and end-of-life failureMajor · ElectricalInverter Coolant Pump Failure – Limp ModeCritical · CoolingRear Caliper Slide Pin Seizure – Brake DragMajor · BrakesTraction Battery Cooling Fan BlockageMajor · Electrical

Compare the Toyota Prius

What these repairs cost on other cars

Some of the Toyota Prius’s documented faults are repairs other models share. Each page lists the documented NZ cost for every model it affects.

Buying guides that cover the Toyota Prius

Other Toyota models

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Toyota Prius buyer questions

Is the Toyota Prius reliable?

Like any used car, it depends on the specific example and its service history. Across the 42 documented faults for the Toyota Prius, the recurring problem areas are transmission, electrical, and engine. A Toyota Prius with a full service history and no signs of the issues listed on this page can be a sound buy but each one needs to be checked individually before you commit.

What are the most common problems with a used Toyota Prius?

We've catalogued 42 known faults for the Toyota Prius, covering transmission, electrical, and engine. All 42 are written out in full on this page, with the symptoms to notice, what to inspect, and typical repair costs for each. Free to read, no account needed.

How much do repairs cost on a Toyota Prius?

Most single repairs on the Toyota Prius fall between $420–$1,100 at NZ independent-workshop rates. Some of the 42 documented faults cost less and a few cost considerably more, and no one car needs them all. Knowing which ones to look for before you view is what lets you negotiate the price down or walk away.

Should I get a pre-purchase inspection on a Toyota Prius?

Yes. A Toyota Prius inspection focused on its known weak points is the single best way to avoid an expensive mistake. KickTyres gives you a guided, model-specific inspection plus a market valuation and negotiation figure for $24.90 far less than the cost of missing one of the faults on this page.