P25F2Turbocharger/Supercharger Boost Sensor C Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- A third boost pressure sensor, C, only makes sense on engines with several charging stages or chargers – for example a supercharger feeding a turbocharger, or a two-stage turbo system – where pressure is measured between the stages as well as ahead of the throttle. Which location carries the letter C is up to the manufacturer. P25F2 is the general circuit fault of this sensor, without separating low, high or implausible signals (those are P25F3 to P25F5); a networked sensor C would report lost communication as U060D instead. No manufacturer documents P25F2 publicly. For sensor A, GM-built Saab engines check the circuit all the time while the ignition is switched on and fall back to mechanical base boost with a clear loss of power, which is the likely reaction here as well.
- What you may notice
- Check engine lamp on
- Reduced power, boost limited to base level
- Likely causes
- LikelyLoose, corroded or oily connector at boost sensor C
- PossibleSignal, 5 V reference or ground wire damaged
- PossibleBoost sensor C failed internally
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €60 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.