U0667Lost Communication With Engine Oil Temperature Sensor A
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- Engine oil temperature feeds warm-up strategies, injection and protection functions, and on recent engines the sensor sends it digitally over SENT. U0667 says that link has failed. Ford's 2023 diesel OBD summary lists the code in its group of SENT sensor monitors, together with the oil pressure sensor (U0600), the mass air flow sensor and others: it sets when the SENT sensor reports a communication error, checked continuously, with 5 s needed to mature. In that table P0195 is also triggered by a SENT communication error, so both may appear together, while the range check P0196 is a separate test. Analog sensors use P0195 to P0199. With no valid reading the controller substitutes a modelled temperature, which can cost some smoothness or power; Ford treats the fault as part of its OBD monitoring.
- What you may notice
- Check engine light
- P0195 stored at the same time
- Oil temperature reading missing in the cluster or scan tool
- Likely causes
- LikelyOil wicking into the sensor connector
- PossibleSensor signal, 5 V supply or ground wire damaged
- PossibleDigital oil temperature sensor failed
- RareEngine controller SENT input faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €40 – €350
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.