Powertrain
generic / SAE
P241F
EGR Cooler B Efficiency Below Threshold
The temperature drop across EGR cooler B is below the calibrated threshold - cooler is fouled with soot, has internal scaling, or coolant flow is restricted. Recirculated gas reaches the intake hotter than designed, increasing NOx and combustion temperatures.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number4 / 1F
Possible causes
- Cooler fouled with soot or scaled high
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: shop recommended
- Estimated cost: 400–1500 €
- Estimated time: 2–5 h
- Component: egr cooler b
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012