Common Symptoms
- Check engine light illuminated
- Reduced engine power or derate mode
- Poor fuel economy
- Increased diesel exhaust fluid (DEF) consumption
- Emission system warning message on dash
Most Likely Root Causes
- Intermittent wiring harness connection to NOx sensor
- Damaged or corroded NOx sensor connector
- Failing NOx sensor due to thermal cycling or contamination
- Loose or corroded ground connections in sensor circuit
- Exhaust leaks near NOx sensor causing sensor damage
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Component Location
The Bank 2 NOx sensor is mounted in the exhaust system downstream of the aftertreatment components on the opposite side from the turbocharger.
Manufacturer Notes
Intermittent NOx sensor codes are often caused by thermal stress on connector pins or harness routing near hot exhaust components.
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