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.
- Tampering with, removal of, or malfunction of SCR catalyst system
- Malfunctioning diesel exhaust fluid dosing system
- Exhaust system leaks
- Degraded, diluted, or incorrect diesel exhaust fluid
- Diesel exhaust fluid deposits in the decomposition tube