Powertrain
generic / SAE
P20EF
Reductant Injection Valve Performance
The SCR reductant injection valve does not deliver the commanded amount of reagent. Causes include clogging by urea crystals, electrical faults or incorrect spray pattern.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number– / EF
Possible causes
- Urea crystals in dosing valve high
- Electrical fault in dosing valve 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: 300–1500 €
- Estimated time: 1–4 h
- Component: def dosing valve
- Component: def pump
- MIL / check engine light
- emissions-relevant
- drive cycle required
- limp mode possible
Sources
References
sae:J2012