Error code

OBD2 P0197

OBD2P0197
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Engine Oil Temperature Sensor Low.

Severity

moderateCan be driven, but monitor for overheating and other symptoms.

Summary

P0197 indicates that the Engine Oil Temperature Sensor is providing low input to the ECM, suggesting an issue with the sensor or its wiring.

Symptoms

  • Malfunction Indicator Light (MIL) illuminated
  • Engine may not reach operating temperature
  • Potential overheating

Common Causes

  • Faulty Engine Oil Temperature Sensor
  • Wiring issues or corrosion in the sensor circuit
  • Extreme cold conditions affecting oil temperature readings

Diagnosis

  1. Check electrical connectors and wire harness for damage.
  2. Verify that the engine is heating up properly and thermostat is functioning correctly.
  3. Perform OBD checks to induce opposite DTCs (P0198) by disconnecting/reconnecting sensor.
  4. Conduct circuit tests with KOEO to check voltage input/output.

Fixes

  • Replace the faulty Engine Oil Temperature Sensor

FAQ

What should I do if my MIL is on and I have P0197?

Check for wiring issues, corrosion, or a faulty sensor. Perform OBD checks to confirm the issue before replacing parts.

Can cold weather cause this code?

Yes, extreme cold can affect oil temperature readings and trigger P0197.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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