P04E6EGR Temperature Sensor D Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- Exhaust gas recirculation (EGR) routes part of the exhaust back into the intake to lower combustion temperature and NOx. Sensor D is the fourth of up to four EGR temperature sensors, conceivable on engines with high- and low-pressure EGR and a sensor before and after each cooler; it is usually an NTC whose low voltage means hot. No manufacturer document available to us uses sensor D; the description follows CARB and Ford's checks on sensor B as a comparison. P04E6 means the signal is electrically valid but implausible – for example it differs from other temperatures after a long stop, does not react when EGR opens, or freezes. Ford compares sensor B with intake and charge air after at least 6 hours off and flags more than 25 °C.
- What you may notice
- Check engine light on
- Usually no change in driving
- EGR possibly reduced, higher NOx
- Likely causes
- LikelySensor drifting (soot or oil crust, ageing)
- PossibleContact resistance in connector or harness (heat, corrosion)
- PossibleReal temperature deviation: EGR cooler or bypass faulty, valve sticking
- RareComparison sensor faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €60 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.