Toyota Voxy: common faults & what to check

Symptoms to notice

• P0A93 (Inverter Cooling System Performance) or P0A94 fault code stored
• Hybrid system warning triangle illuminated
• Audible grinding or absence of expected pump hum from engine bay on start-up
• Inverter coolant reservoir level drops over time with no external leak
• Vehicle enters reduced-power mode or shuts down hybrid drive under sustained acceleration

What to check

With the engine warm, listen for a faint whirring from the inverter coolant pump near the front-left of the engine bay. Check the inverter coolant reservoir (separate small tank, usually near the strut tower) for correct level and absence of rust-coloured contamination indicating pump seal wear. If a workshop inspection is possible: An OBD scanner should show no P0A93 or P0A94 codes.

Symptoms to notice

• Pronounced shudder or vibration felt through the cabin under light throttle at low to mid speeds
• Sensation of the drivetrain slipping or pulsing during steady-speed cruising
• Delayed or sluggish take-up from rest, particularly when the transmission is cold
• CVT fluid that is brown, opaque, or smells burnt when checked

What to check

1. 1.During a test drive, accelerate gently from a standstill to 60 km/h with light throttle and note any vibration or shudder through the floor or seat.
2. 2.Check the CVT fluid colour via the dipstick or drain plug — fluid should be pink/red; brown or burnt-smelling fluid indicates degradation.
3. 3.Ask for full service records showing CVT fluid changes; Toyota recommends fluid renewal every 40,000 km in severe conditions but many owners skip this service.

Symptoms to notice

• Unstable or fluctuating idle, especially on cold start
• P0011 (camshaft timing over-advanced) or Valvematic system DTCs
• Reduced power output and sluggish throttle response
• Rattle or knocking from the valve cover area at idle
• Increased fuel consumption without other apparent cause

What to check

Cold-start the engine and monitor idle quality for the first 60–90 seconds: a stumbling, hunting or surging idle is the earliest indicator. Scan for codes P0011, P0021, or Valvematic-specific Toyota codes (P1349). Physically inspect the Valvematic actuator housing on the left side of the cylinder head for oil seepage, and ask whether 0W-20 Toyota-specified oil has been used consistently.

Symptoms to notice

• Oil level dropping significantly between service intervals requiring mid-interval top-ups
• Blue-grey smoke from exhaust on startup or under hard acceleration
• Oil-fouled spark plugs on inspection
• Low oil warning light appearing before the next scheduled service
• Carbon deposits visible inside exhaust tip

What to check

1. 1.Check oil level on dipstick and ask when it was last topped up.
2. 2.Observe exhaust during cold start and under brisk acceleration for blue smoke.
3. 3.Inspect spark plugs for oil fouling if accessible.
4. 4.Request full oil service history to identify whether intervals have been shortened to compensate.

Symptoms to notice

• Cold-start rattling from front of engine that disappears within 30 seconds of oil pressure build-up
• Check engine light with camshaft position or VVT timing codes
• Rough idle during warm-up phase
• Increasing rattle duration on cold starts as the fault progresses

What to check

Cold-start the engine and listen for 5 to 10 seconds for chain rattle from the timing cover at the front of the engine before oil pressure builds. Any rattle lasting more than a few seconds is a warning sign. Scan for camshaft timing, VVT, or crankshaft correlation codes. Request full service history to verify oil changes at intervals no longer than 10,000 km. Risk is highest above 150,000 km with an incomplete history.

Symptoms to notice

• Hard hot-start requiring extended cranking
• Rough idle and engine stumble under load
• Hesitation on acceleration from low speed
• DTC P0087 (fuel rail or system pressure too low)

What to check

1. 1.Request a fuel rail pressure test; pressure below specification at idle or under acceleration confirms pump wear.
2. 2.Check for stored DTCs relating to fuel system pressure or rail pressure sensor.
3. 3.Inspect fuel filter and quality.
4. 4.The HPFP on the AZR60G is a known failure part with replacement units widely listed for this specific chassis code.

Symptoms to notice

• The K112 CVT fitted to ZRR70 Noah develops shudder and slip as the belt surface wears.
• Confirm with pre-purchase inspection by a qualified mechanic

What to check

The K112 CVT fitted to ZRR70 Noah develops shudder and slip as the belt surface wears.

Symptoms to notice

• Idle RPM hunting or fluctuating between 600 and 1,000 rpm when warm
• Hesitation or stumble on light throttle from standstill
• Rough idle that improves after the engine reaches full operating temperature
• Slight increase in fuel consumption without other mechanical cause
• Occasional rough cold-start idle settling within 30–60 seconds

What to check

With the engine warm and at idle, observe the tachometer for hunting or fluctuating RPM between 600–900 rpm. Also check whether the idle stabilises after a light rev to 2,500 rpm, which temporarily clears deposits. If a workshop inspection is possible: Remove the air intake hose at the throttle body to inspect the throttle plate for thick black carbon deposits — some light coating is normal, heavy build-up above 2mm indicates neglect.

Symptoms to notice

• Red hybrid system warning triangle on instrument cluster
• Traction control (TRAC) warning light
• Loss of EV drive mode — engine runs continuously
• Reduced power limp mode, vehicle limited to approx 40 km/h
• P3190, P3175, or P0A1A OBD fault codes on hybrid scanner

What to check

1. 1.Request a Toyota Techstream or Autel hybrid-capable scan of the hybrid ECU — a basic OBD reader will not access P3190.
2. 2.Test drive under load including EV mode engagement.
3. 3.Check the hybrid battery state-of-health percentage.
4. 4.Inspect HV coolant level in the inverter coolant reservoir.
5. 5.Verify odometer authenticity against service records for high-mileage import risk.

Symptoms to notice

• Red hybrid system warning triangle on dashboard, sometimes with reduced power mode engaged
• Fuel economy noticeably worse than expected — hybrid not deploying EV assist at low speeds
• Cooling fan audible at high speed from rear of cabin in warm weather, even at rest
• Hybrid battery state-of-charge gauge fluctuating rapidly or not charging to full during regenerative braking

What to check

1. 1.Start the vehicle and place your hand near the duct exhaust outlet (typically near the C-pillar trim): you should feel airflow.
2. 2.Check dashboard for any red or amber hybrid system warning icons.
3. 3.A cell voltage spread greater than 0.3V at rest indicates degradation.
4. 4.If a workshop inspection is possible: Use a scan tool capable of reading hybrid battery data (Toyota Techstream or equivalent) to view cell voltage spread and battery temperature values.
5. 5.Lift the rear seat cushion and inspect the battery cooling intake grille — it should be clear of lint and debris.

Symptoms to notice

• Clunking from the front suspension over bumps or during braking
• Vague or wandering steering feel, particularly when changing direction at speed
• Visible torn or cracked rubber dust boot on the ball joint housing

What to check

With the front wheels raised, grip the tyre at 12 and 6 o'clock and apply opposing vertical force to detect axial ball joint play; have an assistant observe the ball joint while you apply load; check for torn or cracked rubber dust boot which accelerates joint wear by allowing contamination.

Symptoms to notice

• Rust bubbles or blistering on painted sill or lower door edge
• Soft spots or perforations in floor pan discovered under carpet
• Rust staining in rear wheel arches or spare tyre well
• Flaking or bubbling undercoating at suspension mounting points

What to check

1. 1.Lift all floor carpets and inspect the floor pan directly, focusing on the centre tunnel, under second and third row seats, and the rear load area.
2. 2.Probe all four inner sills firmly with a screwdriver to detect structural rust behind the paintwork.
3. 3.Inspect both rear wheel arch lips and the spare tyre recess.
4. 4.Check the sub-frame mounting reinforcements for flaking undercoating.
5. 5.If a workshop inspection is possible: Lift the vehicle on a hoist for a full underbody inspection — a roadworthy check alone is insufficient to identify hidden rust.

Symptoms to notice

• Rear-end instability or wandering under load or during lane changes at highway speed
• Uneven rear tyre wear on inner or outer shoulder indicating toe or camber change
• Visible cracking or separation of rubber in rear suspension bush housings

What to check

Watch for: Rear-end instability or wandering under load or during lane changes at highway speed. If a workshop inspection is possible: With the rear axle loaded to normal passenger weight, inspect each bush for visible rubber cracking, debonding from metal sleeves, or visible movement when a pry bar is applied; look for abnormal or uneven rear tyre wear (feathering on inner or outer edge) which indicates toe or camber shift from failed bushes.

Symptoms to notice

• Clunking or thumping from the front suspension over bumps, speed humps, or sharp road edges
• Front end vagueness or wandering on straight roads, requiring constant small steering corrections
• Uneven front tyre wear — excessive wear on inside or outside shoulder despite recent alignment
• Vehicle pulling to one side under firm braking from highway speed

What to check

Visually inspect the rubber bush material: cracking, splitting, or visible voids in the rubber are rejection criteria. Check for fresh alignment report — if caster or camber is out of specification and the vehicle has new tyres, suspect bush wear preventing correct geometry. Drive over a sharp bump at low speed and listen for a thud or double-knock from the front. If a workshop inspection is possible: With the vehicle on a hoist, grasp each front lower arm and attempt to move it vertically and rearward — any movement beyond 1–2 mm indicates bush wear.

Symptoms to notice

• Vehicle pulls to one side during braking, requiring the driver to correct the steering
• One wheel significantly hotter than its counterpart after normal driving, detectable by carefully feeling the wheel rim
• Uneven brake pad wear with the outer pad worn much thinner than the inner pad on the same caliper
• Grinding or squealing noise from one wheel even when the brake pedal is not applied, caused by a dragging pad

What to check

After a test drive of moderate length, carefully feel each wheel rim near the hub for unusual heat; a seized caliper will make one wheel noticeably hotter than its opposite. Inspect the guide pin dust boots for cracking or missing sections. Check pad thickness on both sides of each caliper; a significant difference between inner and outer pad thickness confirms caliper drag. If a workshop inspection is possible: Remove the wheels and attempt to slide each caliper by hand on its guide pins—it should move freely with light finger pressure.

Symptoms to notice

• Clunking or rattling noise from the steering rack area when driving over potholes or road joints
• Knock felt through the steering wheel rim when hitting a bump while cornering
• Loose or notchy feeling on-centre in the steering with slight free play before effort builds
• Intermittent EPS warning light (orange steering wheel icon) during cold weather starts

What to check

1. 1.Drive slowly over a speed bump or rough road surface and listen for a knock or rattle that coincides with steering wheel vibration.
2. 2.With the vehicle stationary, have a second person sharply turn the wheel left and right while you listen under the bonnet for clunking from the rack or intermediate shaft.
3. 3.Check for free play in the steering by gently rocking the wheel left and right — more than 10 mm of play at the rim before the rack moves indicates internal wear.
4. 4.Inspect tie-rod ends for play by gripping and attempting to move them with the wheel straight.

Symptoms to notice

• Rear tailgate stiff or creaking when opening, requiring increasing force over time
• Visible orange rust on hinge pin barrels or around hinge mounting plates at roofline
• Paint bubbling or blistering on body panel adjacent to upper tailgate hinges
• Tailgate fails to latch fully or sits proud of body line on one side after forced opening

What to check

Open and close the rear tailgate several times, noting smoothness — any resistance, creaking, or stiffness indicates hinge corrosion. With tailgate open, inspect both hinge barrels and pins visually for surface rust, pitting, or seized movement. Check the hinge mounting plates on the body for bubbling paint or rust bleed, which indicates corrosion spreading behind the plate. Close the tailgate and inspect the seal line for even gap — a hinge that has shifted under corrosion load will show uneven gap or a misaligned lock latch.