Common Symptoms
- Malfunction indicator lamp illuminated
- Reduced engine power or derate condition
- Poor fuel economy
- Failed emissions test
- Diesel exhaust fluid consumption warnings
Most Likely Root Causes
- Faulty NOx sensor on bank 2
- Damaged or corroded wiring harness to NOx sensor
- Exhaust system leaks near NOx sensor
- Water or contaminant intrusion into sensor connector
- Failed engine control module
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Component Location
The bank 2 NOx sensor is typically located in the exhaust system downstream of the SCR catalyst or diesel particulate filter.
Manufacturer Notes
Some manufacturers require NOx sensor replacement in pairs and system relearn procedures after sensor replacement.
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