General fault in the evaporative emissions system (a leak or component fault).
SYMPTOMS
- Check-engine light
- Occasional fuel odor
LIKELY CAUSES
- Loose or faulty gas cap
- Purge or vent valve fault
- Cracked hose
- Failed charcoal canister
DIAGNOSIS STEPS
- Check the gas cap
- Smoke-test the EVAP system
- Test purge and vent valves
RELATED PARTS
- Gas cap
- Purge valve
- Vent valve
- Charcoal canister