NOx Sensor Circuit High (Bank 2)
NOx Sensor Circuit High (Bank 2): the signal voltage is above the expected range. Often an open circuit or a short to supply voltage.
Affected components
- Nox sensor
Common causes
- High likelihood: Open signal line
- Low likelihood: Connector pins corroded - high contact resistance
- Low likelihood: Supply wire pinched against B+ source
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
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.