Powertrain
generic / SAE
P20A1
Reductant Purge Control Valve A Performance
Reductant purge control valve A is electrically OK but does not vent the line within the expected time — partial blockage or weakened solenoid.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number– / A1
Possible causes
- Partial blockage from crystallisation 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 purge valve
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012