Possible Cause
WARNING: This page is about a different car, the 2018 Nissan Titan XD. However, it is still accessible from the selected car via links, so may be relevant.
- The ECM has detected the NOx reading is higher or lower than is possible from the engine output
- Exhaust system leaks
- Incorrectly installed aftertreatment intake NOx sensor
- Aftertreatment intake NOx sensor has carbon buildup on the tip
- Excessive oil consumption
- Possible engine misfire
- NOx sensor part number is incorrect