Powertrain
generic / SAE
P203A
Reductant Level Sensor A Circuit
A general electrical fault is reported on DEF level sensor A — open, shorted, or out of plausibility. Some tanks use multiple level senders to cover irregular tank shapes; this is the primary one.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number– / 3A
Possible causes
- Sender failed — float, swing arm, or rheostat high
- Harness or connector fault 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: 120–800 €
- Estimated time: 1–4 h
- Component: reductant level sensor
- Component: reductant tank
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012