Powertrain
generic / SAE
P20CF
Exhaust Aftertreatment Fuel Injector A Stuck Open
HC injector A is mechanically stuck open — fuel leaks continuously into the exhaust, can ignite uncontrolled regeneration.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number– / CF
Possible causes
- Injector stuck open high
- Carbon or debris buildup preventing free movement low
- Component wear with age - mechanical play low
Symptoms
- Check engine light on
- Misfire or rough idle on the affected cylinder
- Increased fuel consumption
- Possible fuel smell or smoke from exhaust
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 250–2000 €
- Estimated time: 1–5 h
- Component: aftertreatment fuel injector
- MIL / check engine light
- emissions-relevant
- limp mode possible
Sources
References
sae:J2012