Powertrain
generic / SAE
P2BAE
NOx Exceedence - EGR System
NOx emissions are above the legal threshold and the ECU isolates the cause to the EGR system. EGR flow is too low or absent under operating conditions where NOx reduction is required.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / numberB / AE
Possible causes
- EGR valve stuck closed high
- Carbon clogged EGR passages 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: hard
- DIY: shop recommended
- Estimated cost: 300–1800 €
- Estimated time: 1.5–6 h
- Component: egr valve
- Component: egr cooler
- Component: egr diff pressure sensor
- MIL / check engine light
- emissions-relevant
- drive cycle required
- limp mode possible
Sources
References
sae:J2012