Powertrain
generic / SAE
P24A5
EGR Cooler Bypass Control Stuck Open Bank 1
The EGR cooler bypass valve on bank 1 is mechanically stuck in the open (bypassing) position - EGR always bypasses the cooler, gas reaches the intake hotter than designed.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number4 / A5
Possible causes
- Valve stuck open high
- Carbon or debris buildup preventing free movement low
- Component wear with age - mechanical play low
Symptoms
- Check engine light on
- Pinging or knocking under load
- Power loss and hesitation
- Possible rough idle
- Failed emissions inspection (NOx)
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 200–800 €
- Estimated time: 1–3 h
- Component: egr cooler bypass valve b1
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012