Powertrain
generic / SAE
P040A
EGR Temperature Sensor A Circuit
A general electrical fault on EGR temperature sensor A — open, shorted, or out of plausibility. The sensor monitors recirculated exhaust gas temperature for EGR cooler protection and dosing.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number4 / 0A
Possible causes
- Sensor failed high
Symptoms
- Check engine light on
- Pinging or knocking under load
- Power loss and hesitation
- Possible rough idle
- Failed emissions inspection (NOx)
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 60–400 €
- Estimated time: 0.5–2 h
- Component: egr temperature sensor
- Component: egr cooler
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012