P0E82Auxiliary Cooling System Coolant Temperature Sensor A 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
- P0E82 is set when temperature sensor A of the auxiliary cooling loop delivers a clean electrical signal whose value does not make sense against other temperatures. No manufacturer documents P0E82 publicly, but Ford's 2019 hybrid summary spells out such a plausibility test for its heater-loop sensor ECT2 under P2183. After at least 360 minutes of soak both coolant sensors must agree within 30 °F; with the loops joined and the electric pump above 2,500 rpm for 90 seconds, ECT2 plus a 7 °F hose loss must stay within 30 °F of the engine sensor; and the reading must stay between −30 and 275 °F. CARB includes hybrid component temperature sensors in its rationality requirements. A sensor that drifts, or a stuck bypass valve that keeps the loops apart, can trip it. Pure circuit faults are P0E81, P0E83 and P0E84.
- What you may notice
- Check engine light
- Cabin heat regulation off target
- Likely causes
- LikelySensor A reading drifted out of tolerance
- PossibleStuck bypass valve keeping the loops from mixing
- PossibleLow coolant or air around the sensor tip
- RareCorroded terminals shifting the signal
- 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: €40 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.