OBD-II code · Powertrain (generic, extended)
P208F Reductant Injection Valve Stuck Closed (Bank 2 Unit 1)
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.
Is it safe to drive with P208F?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyNozzle crystallised
- Less likelyCarbon or debris buildup preventing free movement
- Less likelyComponent wear with age - mechanical play
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)
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.7–3 h
- Emissions test
- Likely to fail
- Parts involved
- Reductant Injection Valve
Related codes
- P208EReductant Injection Valve Stuck Closed (Bank 1 Unit 1)
- P208CReductant Pump A Control Circuit Low
- P208DReductant Pump A Control Circuit High
- P2090Camshaft Position B Actuator Control Circuit Low (Bank 1)
- P2091Camshaft Position B Actuator Control Circuit High (Bank 1)
- P2092A Camshaft Position Actuator Control Circuit Low (Bank 2)
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.