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OBD-II · Engine and powertrain (P)

P0197

Engine oil temperature sensor circuit low

What it means

The oil temperature signal voltage is below its valid range, usually a short to ground or a failed sensor.

Symptoms

  • engine warning light
  • wrong or missing oil temperature reading
  • often no noticeable change in driving

Likely causes, most likely first

Likely causes, most likely first
No.Cause
01signal wire short to ground
02failed sensor
03damaged wiring under the engine
04connector corrosion

What to check, step by step

  1. 01Check the oil level (on many European cars the oil temperature sensor is combined with the oil level sensor in the sump)
  2. 02Compare the oil temperature with coolant temperature after an overnight cold soak: they should be close
  3. 03Inspect the sensor connector and wiring, especially under the sump where it is exposed to water and salt
  4. 04Replace the sensor if the wiring is good