Powertrain
generic / SAE
P040F
EGR Temperature Sensor A/B Correlation
EGR temperature sensors A and B disagree by more than the allowed tolerance over a drive cycle. EGR mixes inert exhaust into intake to lower combustion peak temperature — too little raises NOx, too much causes misfires and rough running.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number4 / 0F
Possible causes
- One sensor drifts 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: 60–500 €
- Estimated time: 0.5–2 h
- Component: egr temperature sensor
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012