Prius
2 generations · Select a generation to see engines
Which Toyota Prius engine is the most reliable? See common problems, reviews and reliability verdicts across generations and engines.
Frequently asked questions
Which Toyota Prius engine is the most reliable?
1.5 Hybrid (1NZ-FXE) (Prius (XW20)) — Proven verdict. The second-gen Prius (XW20) is one of the most durable cars ever made — the 1NZ-FXE Atkinson engine and Toyota's HSD run unstressed with no clutch or conventional gearbox to wear, and huge numbers are still working as taxis at extreme mileage. The only real considerations are hybrid-battery ageing (still often healthy, and replaceable/reconditionable) and the inverter coolant pump. Verify the battery state of health and you have an exceptionally dependable, frugal car.
Which Toyota Prius engines should you avoid?
None of the Toyota Prius engines listed are rated "Problematic" or "Avoid" — but always check the service history before buying.
What are the most common Toyota Prius problems?
The most commonly reported problems across all Toyota Prius generations and engines: Hybrid battery ageing, Inverter coolant pump, EGR / coolant circuit carbon.