OBD-II code · Powertrain (generic)
P039F Cylinder 2 Pressure Sensor Circuit
A general electrical fault on the cylinder 2 combustion pressure sensor — used on engines with closed-loop combustion control (e.g. some Volvo and BMW direct-injection diesels) to measure cylinder pressure directly via a sensor at the glow plug or injector position.
Is it safe to drive with P039F?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelySensor failed
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–4 h
- Emissions test
- Likely to fail
- Parts involved
- Cylinder Pressure Sensor
Related codes
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- P039CCylinder 1 Pressure Variation Low
- P039DCylinder 1 Pressure Variation High
- P039ECylinder 1 Combustion Performance
- P03A0Cylinder 2 Pressure Sensor Circuit Range/Performance
- P03A1Cylinder 2 Pressure Sensor Circuit Low
- P03A2Cylinder 2 Pressure Sensor Circuit High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.