Powertrain
generic / SAE
P04D1
EGR Temperature Sensor C Circuit High
Same as P04CE with the signal voltage above the plausible range. 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 / D1
Possible causes
- Signal shorted to supply high
- Connector pins corroded - high contact resistance low
- Supply wire pinched against B+ source low
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: 120–400 €
- Estimated time: 0.6–1.6 h
- Component: egr temperature sensor c
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012