Powertrain
generic / SAE
P04B4
Refueling Vapor Control Valve Stuck Closed
Same as P04B3 with the valve stuck closed - vapor cannot reach the canister during refueling, vapor escape from the filler is possible.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number4 / B4
Possible causes
- Valve stuck closed due to seal or debris high
- Carbon or debris buildup preventing free movement low
- Component wear with age - mechanical play low
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 120–400 €
- Estimated time: 0.8–1.8 h
- Component: refueling vapor valve
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012