P0442 on BMW — EVAP System Small Leak Detected
BMW
Verified1 source
1 source
- Official data (NHTSA)official_feed
What P0442 means
Safe to drive short-term
A small leak was detected in the fuel vapor recovery system — most often a loosely sealed fuel filler cap.
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General information, not a diagnosis or repair instruction. Always confirm with a qualified mechanic for your specific vehicle.
Common causes
- Cracked EVAP system hose
- Cracked or disconnected EVAP hose
- Faulty purge or vent valve
- Loose or worn fuel cap
- Loose or faulty fuel cap
Symptoms
- Occasional fuel odor
- Check-engine light with no drivability change
What to check first
- Check and properly seat the fuel cap
- Smoke-test the EVAP system
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