P208F: Reductant Injection Valve Stuck Closed (Bank 2 Unit 1)
Standardized SAE J2012 code · P20xx — Fuel & air metering and auxiliary emission controls
What does P208F mean?
The DEF injection valve at bank 2 unit 1 does not open when commanded — typically crystallised DEF blocks the nozzle, no flow into the SCR.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
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)
Common causes
- High Nozzle crystallised
- Low Carbon or debris buildup preventing free movement
- Low Component wear with age - mechanical play
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P208F on the same make and model first.
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