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U0667 Lost Communication With Engine Oil Temperature Sensor A

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modeNo

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.

Likely causes

Oil wicking into the sensor connector

Sensor signal, 5 V supply or ground wire damaged

Digital oil temperature sensor failed

Engine controller SENT input faulty

Symptoms

Check engine light
P0195 stored at the same time
Oil temperature reading missing in the cluster or scan tool

Repair estimate

DifficultyEasyDIY possible

Parts and labour€40–350

Time0.3–1.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

engine oil temp sensor avehicle bus wiring

References: fordservicecontent.com, law.cornell.edu, en.wikipedia.org.