Reductant Injection Air Pressure Sensor A Circuit Intermittent
The reductant injection air-pressure sensor A signal jumps or drops out intermittently — connector or harness issue.
Affected components
- Reductant air pressure sensor
- Reductant air pressure connector
Common causes
- High likelihood: Intermittent connector or chafed wire
- Low likelihood: Connector with intermittent contact under vibration
- Low likelihood: Harness routed against vibrating component
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.