Powertrain
generic / SAE
P25D6
Exhaust Heat Exchanger Exhaust Bypass Valve A Position Sensor Stop Performance
During self-calibration of the exhaust heat exchanger bypass valve A, the position sensor never reached the expected mechanical stop. The controller cannot zero the position reference, so commanded openings will be inaccurate.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number5 / D6
Possible causes
- Soot or carbon deposits prevent valve from reaching the stop high
- Worn linkage between actuator and valve flap medium
- Position sensor not aligned with valve shaft medium
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 250–1500 €
- Estimated time: 1.5–5 h
- Component: exhaust heat exchanger
- Component: bypass valve actuator
- Component: position sensor
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012