P246FExhaust Gas Temperature Sensor Circuit Range/Performance (Bank 1 Sensor 4)
- 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
- P246F stands for a fourth bank 1 exhaust temperature probe whose signal is electrically fine but physically implausible. Both main users test it after a long soak. Ford's diesels compare it with three other probes after at least 6 h off and allow no more than 50 °C between them, which unmasks a probe stuck at one value. GM's 2025 diesel tables wait for more than 10,800 s engine-off, then compare how far the probe warms within a calibrated time against a temperature map; too little rise points to a probe that has slipped from the pipe, or to a frozen signal, rated Type B with the MIL in the second trip. Electrical faults of the probe are P2470 to P2472, while P246E covers the model comparison on Ford. A plausibility fault often follows a loose probe after exhaust work.
- What you may notice
- MIL on after the second faulty trip
- Probe disagrees with neighbouring temperatures after a cold start
- Usually no noticeable change in driveability
- Likely causes
- LikelyProbe stuck at one value or drifting
- PossibleProbe loose or backed out of the exhaust pipe
- RareProbe connectors swapped with a neighbouring sensor
- 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: €0 – €350
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.