The computer found a problem in the system that holds fuel vapour. The driver usually sees only the engine light and may smell fuel.
Causes vary by car. Test before you order a part.
Likely causes, most common first
- Loose or worn fuel cap
- Faulty purge or vent valve
- Cracked EVAP hose
- Damaged charcoal canister
Parts usually involved
- Fuel cap Find at suppliers
- Purge valve Find at suppliers
- Vent valve Find at suppliers
- Charcoal canister Find at suppliers
Test before you replace
Inspect the cap and hoses, then smoke test the EVAP system and command the valves with a scan tool.
General guidance for generic OBD2 codes. Always follow the maker's procedure for the car in front of you.