Powertrain
generic / SAE
P206A
Reductant Quality Sensor Circuit
A general electrical fault is reported on the DEF (urea) quality sensor — measures urea concentration via ultrasonic or refractive method to detect water dilution or wrong fluid.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number– / 6A
Possible causes
- Sensor failed high
- Harness 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: 200–1500 €
- Estimated time: 1–4 h
- Component: reductant quality sensor
- Component: reductant tank
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012