Powertrain
generic / SAE
P042E
EGR A Control Stuck Open
EGR valve A is mechanically stuck open — exhaust gas continues to flow into the intake at all times, causing rough idle and lean condition during acceleration.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number4 / 2E
Possible causes
- Carbon buildup holds valve 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: 80–800 €
- Estimated time: 0.7–3 h
- Component: egr valve
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012