Powertrain
generic / SAE
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.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number5 / F4
Possible causes
- Internal short in the sensor element high
- Signal wire shorted to ground medium
- Connector pins corroded - high contact resistance low
Symptoms
- Check engine light on
- Significant power loss / limp mode
- Possible blue or black smoke from exhaust
- Whistling or hissing sound from intake
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 80–400 €
- Estimated time: 0.5–2 h
- Component: boost pressure sensor c
- Component: wiring harness
- MIL / check engine light
Sources
References
sae:J2012