OBD-II code · Powertrain (generic)
P06EA NOx Sensor Processor Performance Bank 1 Sensor 1
An internal self-test in the control module reports a fault in its processing of the "NOx sensor processing, bank 1 sensor 1" value. The module computes and cross-checks this value redundantly inside its own processor; when the results disagree, the code sets. It points to a hardware or software fault inside the module itself, not to a defect of the external sensor. Causes are an internal processor or memory fault, corrupted control-module software, or low or disturbed module supply voltage.
Is it safe to drive with P06EA?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyInternal software anomaly
- Less likelyModule software outdated, reflash may resolve
- Less likelySupply voltage outside specification
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
- 2–8 h
- Emissions test
- Likely to fail
- Parts involved
- Ecu Internal Processing, Nox Sensor B1s1
Related codes
- P06EBNOx Sensor Processor Performance Bank 1 Sensor 2
- P23ABNOx Sensor Processor Performance Bank 1 Sensor 3
- P06E7Sensor Power Supply C Circuit Low
- P06E8Sensor Power Supply C Circuit High
- P06E9Engine Starter Performance
- P06ECFuel Injector Control Module Requested MIL Illumination
- P06EDEngine RPM Output Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.