Powertrain
generic / SAE
P2043
Reductant Temperature Sensor A Circuit Range/Performance
Reductant temperature sensor A reading is within electrical range but plausibility check fails — slow response or sticks at one value through a tank-warming cycle.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number– / 43
Possible causes
- Sensor drifts or sticks high
- Sensor element aged beyond calibration window low
- Sensor mounting loose - signal damping low
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: 80–600 €
- Estimated time: 0.7–2.5 h
- Component: reductant temperature sensor
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012