NOx Sensor Circuit (Bank 2)
A general electrical fault on the bank 2 NOx sensor circuit. NOx sensors are smart sensors with a CAN/LIN interface; this code typically indicates that the sensor module no longer responds.
Affected components
- Nox sensor b2
- Nox sensor wiring
Common causes
- High likelihood: NOx sensor module failed
- Medium likelihood: Wiring open or connector loose
Possible 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)
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.