Powertrain
generic / SAE
P208E
Reductant Injection Valve Stuck Closed (Bank 1 Unit 1)
The DEF injection valve at bank 1 unit 1 does not open when commanded — typically crystallised DEF blocks the nozzle, no flow into the SCR.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number– / 8E
Possible causes
- Nozzle crystallised high
- Valve seized medium
- Carbon or debris buildup preventing free movement low
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: medium
- DIY: shop recommended
- Estimated cost: 150–1000 €
- Estimated time: 0.7–3 h
- Component: reductant injection valve
- MIL / check engine light
- emissions-relevant
- limp mode possible
Sources
References
sae:J2012