P202E: Reductant Injection Valve Circuit Range/Performance (Bank 1 Unit 1)
Standardized SAE J2012 code · P20xx — Fuel & air metering and auxiliary emission controls
What does P202E mean?
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.
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 DEF crystallisation in nozzle
- Low Sensor element aged beyond calibration window
- Low Sensor mounting loose - signal damping
Likelihood is a general estimate across vehicles; your make and model may differ.
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