Powertrain
generic / SAE
P2BAD
NOx Exceedence - Insufficient Reagent Consumption
The aftertreatment system detects elevated NOx emissions while reagent (AdBlue/DEF) consumption is below the expected level. Causes include clogged dosing injector, incorrect dosing rate or tampering.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / numberB / AD
Possible causes
- Clogged DEF dosing valve high
- Incorrect dosing calibration medium
Symptoms
- Check engine light or NOx warning on
- AdBlue/DEF level or quality warning
- Possible no-start countdown after ignore period
- Failed emissions inspection (NOx)
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 200–1500 €
- Estimated time: 1–5 h
- Component: def dosing valve
- Component: scr catalyst
- Component: nox sensor
- MIL / check engine light
- emissions-relevant
- drive cycle required
- limp mode possible
Sources
References
sae:J2012