Powertrain
generic / SAE
P23A5
Exhaust Heat Exchanger Bypass Valve B Control Performance
The bypass flap A of the exhaust heat exchanger does not move as commanded - the position feedback or downstream temperature does not respond to the control demand. The flap is mechanically stuck, the actuator gearing is worn, or the position sensor is offset.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number3 / A5
Possible causes
- Flap stuck due to soot or carbon high
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 250–1200 €
- Estimated time: 1.5–4 h
- Component: exhaust bypass valve b
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012