NOx Sensor Circuit Intermittent (Bank 2)
The bank 2 NOx sensor reports correctly some of the time but intermittently drops out. Often a marginal connector, a wiring chafe or a sensor that fails when warm.
Affected components
- Nox sensor b2
- Nox sensor wiring
Common causes
- High likelihood: Connector intermittent
- Medium likelihood: Sensor fails when hot
- Low likelihood: Harness routed against vibrating component
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.