Cause
Faulty cylinder pressure sensor
The in-cylinder sensor that watches combustion directly, failed or drifting — and on the engines that carry one, deliberately the last name on most of its own codes' lists, because the wiring to a sensor screwed into a cylinder head fails far more often than the sensor sealed inside it.
When it genuinely is the sensor, the failure is usually drift: the element ages in the pressure and heat it measures, and the reading wanders rather than dying. The engine's own cross-check convicts it cleanly — with fuel cut on overrun, all cylinders trace near-identical pure compression, so one sensor disagreeing with its siblings under those conditions has identified itself. The exception worth knowing: a pressure trace too smooth to be real (the Variation Low codes) inverts the usual order and puts this sensor first, since healthy combustion always varies a little and only a dead element reports otherwise.
On most diesels the sensor is integrated into the glow plug, which sets the honest price of replacement — a pressure-sensing glow plug, not a plain one.
Typically a moderate job.
Codes this can cause (16)
Codes where this is a likely explanation first, rather than merely a possible one.
- P2349 Cylinder 9 Pressure Sensor Circuit Range/Performance Likely for this code Moderate
- P2353 Cylinder 10 Pressure Sensor Circuit Range/Performance Likely for this code Moderate
- P2359 Cylinder 10 Pressure Variation Low Likely for this code Moderate
- P2363 Cylinder 11 Pressure Variation Low Likely for this code Moderate
- P2367 Cylinder 12 Pressure Sensor Circuit Range/Performance Likely for this code Moderate
- P2348 Cylinder 9 Pressure Sensor Circuit Moderate
- P2350 Cylinder 9 Pressure Variation High Moderate
- P2351 Cylinder 9 Combustion Performance Moderate
- P2352 Cylinder 10 Pressure Sensor Circuit Moderate
- P2357 Cylinder 10 Pressure Too Low Moderate
- P2358 Cylinder 10 Pressure Too High Moderate
- P2361 Cylinder 11 Pressure Too Low Moderate
- P2362 Cylinder 11 Pressure Too High Moderate
- P2364 Cylinder 11 Pressure Variation High Moderate
- P2365 Cylinder 11 Combustion Performance Moderate
- P2366 Cylinder 12 Pressure Sensor Circuit Moderate
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