Powertrain
generic / SAE
P234D
Cylinder 9 Pressure Too Low
Cylinder 9 measured peak combustion pressure is below the calibrated minimum — typically low compression, weak injection, or stuck-open exhaust valve.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number3 / 4D
Possible causes
- Low compression on cylinder 9 (valves, rings, head gasket) high
- Injector flow too low medium
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 400–3500 €
- Estimated time: 2–10 h
- Component: cylinder 9 combustion
- Component: cylinder compression
- Component: fuel injector cyl 9
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012