Common Symptoms
- Check engine light illuminated
- NOx sensor heater code may accompany primary fault
- Diesel emissions system warning message on instrument cluster
- Reduced engine power or derate in severe cases
- Diesel exhaust fluid consumption may appear abnormal
- Vehicle may fail emissions testing
Most Likely Root Causes
- Failed NOx sensor on bank 2
- Damaged or corroded NOx sensor wiring harness
- Exhaust leaks near NOx sensor causing false readings
- Water or diesel exhaust fluid contamination of sensor connector
- ECM software calibration issue requiring update
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Component Location
The bank 2 NOx sensor is typically located in the exhaust system downstream of the diesel particulate filter or after the SCR catalyst.
Manufacturer Notes
Some diesel platforms require NOx sensor relearn procedures after replacement and ECM calibration updates may address false circuit faults.
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