U0667 code meaning
Lost Communication With Engine Oil Temperature Sensor A
Network system Generic code U06xx codes Check engine light
What U0667 means
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.
U0667 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyEasy, DIY possible
- Typical labor0.3 to 1.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0667
- Check engine light
- P0195 stored at the same time
- Oil temperature reading missing in the cluster or scan tool
Common causes of U0667
- Most likelyOil wicking into the sensor connector
- PossibleSensor signal, 5 V supply or ground wire damaged
- PossibleDigital oil temperature sensor failed
- Less likelyEngine controller SENT input faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Engine oil temp sensor aVehicle bus wiring
What each part of U0667 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 67 | The exact fault in that area. |
What to do next
- Note U0667 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U0667
What does U0667 mean?
U0667 means "Lost Communication With Engine Oil Temperature Sensor A". Engine oil temperature feeds warm-up strategies, injection and protection functions, and on recent engines the sensor sends it digitally over SENT. It is a generic code, so it means the same on every make.
Is it safe to drive with U0667?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will U0667 fail an emissions test?
Yes, it can. U0667 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is U0667 to fix?
Difficulty: easy. A typical repair takes 0.3 to 1.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will U0667 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.