Chassis
generic / SAE
P25C5
Brake Booster Temperature Sensor A Circuit Range/Performance
The booster temperature sensor reading is implausible relative to commanded assist or coolant temperature. The signal moves too slowly, sticks, or never reaches expected values during operation.
SystemChassis
Typegeneric / SAE
GroupP2
Range / number5 / C5
Possible causes
- Sensor drift or contamination on the temperature element medium
- Sensor not seated properly against the booster motor housing medium
- Sensor element aged beyond calibration window 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: hard
- DIY: shop recommended
- Estimated cost: 200–1200 €
- Estimated time: 1–3.5 h
- Component: electric brake booster
- Component: temperature sensor
- MIL / check engine light
Sources
References
sae:J2012