Thinking about buying a used Toyota Prius (2003–2023) in New Zealand? We've documented 46 known faults for this model spanning transmission, electrical, engine, and brakes. Each researched and verified before it's published. The most serious issues here are rated critical. Two are set out in full below — the rest, with the symptoms, repair costs and checks for each, are free with an account.
46
Documented faults
Critical
Most serious
$450–$1,350
Typical repair
7
Systems covered
Known Toyota Prius faults
Every fault below is documented specifically for this model — researched and verified before it’s published.
CriticalOccasionalTransmission $3,500–$8,500 to fix
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
Scan hybrid ECU for DTCs P3190 and P3105 using a Toyota-capable scanner. Check transaxle resolver harness connector under centre console for corrosion or pushed pins. Note odometer — resolver faults concentrate above 120,000 km. 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?”
02Windscreen stress cracking (XW50)
MinorOccasionalBody & Rust $600–$1,500 to fix
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?”
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44 more documented faults on the Toyota Prius
Symptoms, what to check, where to look and what to ask the seller — for every fault above. Free with an account, no card needed. One account covers one vehicle, so make it the car you’re actually looking at.
This page covers the model. Enter the plate of the actual car you’re looking at and see its year, engine, safety rating and register flags — free, no account needed.
Like any used car, it depends on the specific example and its service history. Across the 46 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?
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We've catalogued 46 known faults for the Toyota Prius, covering transmission, electrical, and engine. Two are written out in full on this page. The rest — with the symptoms to notice, what to inspect, and typical repair costs for each — are free once you create an account.
How much do repairs cost on a Toyota Prius?
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Most single repairs on the Toyota Prius fall between $450–$1,350 at NZ independent-workshop rates. Some of the 46 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?
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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 $17.90 far less than the cost of missing one of the faults on this page.