OBD-II code · Powertrain (generic, extended)
P202E Reductant Injection Valve Circuit Range/Performance (Bank 1 Unit 1)
Reductant Injection Valve Circuit Range/Performance (Bank 1 Unit 1): the signal is implausible or outside the valid range. This valve doses reductant (DEF/AdBlue) into the exhaust for SCR NOx reduction.
Is it safe to drive with P202E?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyDEF crystallisation in nozzle
- Less likelySensor element aged beyond calibration window
- Less likelySensor mounting loose - signal damping
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
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–4 h
- Emissions test
- Likely to fail
- Parts involved
- Reductant Injection Valve, Reductant Metering Unit
Related codes
- P201AReductant Injection Valve Circuit Range/Performance (Bank 2 Unit 1)
- P202BReductant Tank Heater Control Circuit Low
- P202CReductant Tank Heater Control Circuit High
- P202DReductant Leakage
- P202FReductant/Regeneration Supply Control Circuit Range/Performance
- P2030Fuel Fired Heater Performance
- P2031Exhaust Gas Temperature Sensor Circuit (Bank 1 Sensor 2)
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.