Powertrain
generic / SAE
P2457
EGR Cooler Performance
The EGR cooler does not lower exhaust gas temperature as expected — typically internal coolant fouling, a partial blockage, or a cracked cooler that mixes coolant with exhaust gas.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number4 / 57
Possible causes
- Cooler internally clogged with soot high
- Cooler cracked, coolant entering exhaust medium
Symptoms
- Check engine light on
- Pinging or knocking under load
- Power loss and hesitation
- Possible rough idle
- Failed emissions inspection (NOx)
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 400–2500 €
- Estimated time: 2–8 h
- Component: egr cooler
- Component: egr temperature sensor
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012