Common Symptoms
- Check Engine Light or Malfunction Indicator Lamp illuminated
- Diesel Exhaust Fluid (DEF) consumption warning or message
- Reduced engine power or derate condition
- Emission system fault warning displayed on instrument cluster
- Vehicle may enter limp mode on some models
Most Likely Root Causes
- Failed or contaminated NOx sensor in Bank 2
- Damaged or corroded wiring harness to NOx sensor
- Poor electrical connection at NOx sensor connector
- Exhaust system leaks near NOx sensor mounting location
- Aftertreatment system software calibration issue
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Component Location
The Bank 2 NOx sensor is located in the exhaust system downstream of the SCR catalyst or DPF, typically mounted in the exhaust pipe or outlet.
Manufacturer Notes
NOx sensors are sensitive to contamination from coolant, oil, or fuel additives entering the exhaust stream and may require replacement if contaminated.
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