Powertrain
generic / SAE
P04A5
Exhaust Pressure Control Valve B Stuck Closed
Same as P04A4 but the valve B is stuck closed - back-pressure stays high even when the engine should run with low restriction; risk of overheating or excessive fuel consumption.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number4 / A5
Possible causes
- Valve stuck closed due to soot or broken linkage high
- Carbon or debris buildup preventing free movement low
- Component wear with age - mechanical play low
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 250–1200 €
- Estimated time: 1.5–4 h
- Component: exhaust pressure valve b
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012