Powertrain
generic / SAE
P20A7
Reductant Injection Air Pressure Control Valve Performance
Reductant air-pressure control valve is electrically OK but cannot hold or modulate pressure within calibration — partial blockage or weak solenoid.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number– / A7
Possible causes
- Partial blockage high
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: 100–700 €
- Estimated time: 0.7–2.5 h
- Component: reductant air pressure control valve
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012