The leak test found a large leak in the fuel vapour system. The driver may smell fuel or see only the engine light.
Likely causes, most common first
- Fuel cap loose, missing or worn
- Disconnected or split EVAP hose
- Purge or vent valve stuck open
- Leak at the tank or filler neck
Parts usually involved
- Fuel cap
- EVAP hoses
- Purge valve
- Vent valve
Test before you replace
Check the fuel cap first, then look for disconnected hoses and smoke test the system.
General guidance for generic OBD2 codes. Always follow the maker's procedure for the car in front of you.