Reductant Injection Air Pressure Sensor A Circuit
A general electrical fault is reported on reductant injection air-pressure sensor A — used on air-assisted DEF dosing systems to monitor the atomisation air pressure delivered to the injector.
Affected components
- Reductant air pressure sensor
- Reductant air pump
Common causes
- High likelihood: Air pressure sensor failed
- Medium likelihood: Harness fault between sensor and PCM
Possible symptoms
- Check engine light or NOx warning on
- AdBlue/DEF level or quality warning
- Possible no-start countdown after ignore period
- Failed emissions inspection (NOx)
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.