Powertrain
generic / SAE
P234B
Cylinder 9 Pressure Sensor Circuit High
Cylinder 9 pressure sensor above upper plausibility — open signal or short to B+. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number3 / 4B
Possible causes
- Signal line shorted to supply high
- Sensor ground open medium
- Connector pins corroded - high contact resistance low
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 400–1800 €
- Estimated time: 1.5–5 h
- Component: cylinder pressure sensor 9
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012