OBD-II code · Powertrain (generic, extended)
P25F4 Turbocharger/Supercharger Boost Sensor C Circuit Low
The third boost pressure sensor signal is below the lower diagnostic threshold. Usually a shorted sensor element or a short to ground.
Is it safe to drive with P25F4?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyInternal short in the sensor element
- PossibleSignal wire shorted to ground
- Less likelyConnector pins corroded - high contact resistance
Symptoms
- Check engine light on
- Significant power loss / limp mode
- Possible blue or black smoke from exhaust
- Whistling or hissing sound from intake
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2 h
- Emissions test
- Usually unaffected
- Parts involved
- Boost Pressure Sensor C, Wiring Harness
Related codes
- P0241Turbocharger/Supercharger Boost Sensor B Circuit Low
- P25F1Vacuum Pump Control Circuit B High
- P25F2Turbocharger/Supercharger Boost Sensor C Circuit
- P25F3Turbocharger/Supercharger Boost Sensor C Circuit Range/Performance
- P25F5Turbocharger/Supercharger Boost Sensor C Circuit High
- P25F6AIR System B
- P25F7AIR System B Incorrect Flow Detected
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.