Faults by engine

Choose your car’s engine to see its known faults, which versions to avoid and which models it is fitted to. The same engine goes into cars from several brands, so its faults recur in all of them.

Looking for a specific part (turbo, EGR valve, belt, injectors…)? Faults by part · Do you know your engine code? Look it up by code

168 engines and gearboxes694 documented faults

The risk index (0–100) summarises the severity and frequency of each engine’s most serious faults. How we calculate it

We mark in amber the engines with a wet timing belt (belt-in-oil). Which engines use it and what faults they have

Reviewed on 9 October 2026How we work

Petrol engines

85 documented engines

Diesel engines

66 documented engines

Gearboxes

16 documented gearboxes

Other engines

1 documented engine

Subaru bóxerSubaru bóxer (gasolina EJ and FB and diésel EE20)SubaruProduction since 2007Timing drive: Chain7 faults· the most serious:Critical severityRisk indexHigh risk59

Don’t know which engine your car has?

Search by engine name or code

You can also search by car model or by symptom.