Powertrain
generic / SAE
P202D
Reductant Leakage
A leak has been detected in the DEF (urea) supply system — usually by a pressure-decay test after pump shutdown, or by visible crystallisation around fittings.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number– / 2D
Possible causes
- Cracked DEF line or fitting high
- Pump seal leaking medium
- Injector mounting seal leaking 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: hard
- DIY: shop recommended
- Estimated cost: 120–1500 €
- Estimated time: 1–4 h
- Component: reductant supply line
- Component: reductant pump
- Component: reductant injection valve
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012