Powertrain
generic / SAE
P2037
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.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number– / 37
Possible causes
- Air pressure sensor failed high
- Harness fault between sensor and PCM medium
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)
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 80–500 €
- Estimated time: 0.7–2 h
- Component: reductant air pressure sensor
- Component: reductant air pump
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012