Error code

OBD2 P0198

OBD2P0198
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Engine Oil Temperature Sensor High.

Severity

moderateCan drive, but monitor symptoms and address promptly.

Summary

P0198 indicates an issue with the Engine Oil Temperature Sensor providing high input readings to the ECM. This sensor is located in the engine oil system.

Symptoms

  • Malfunction Indicator Light (MIL) illuminated
  • Engine overheating
  • Low cabin heat

Common Causes

  • Faulty EOT sensor
  • Wiring short to positive
  • Extreme cold conditions
  • Racing or towing activities

Diagnosis

  1. Check electrical connectors and wire harness for damage.
  2. Verify proper engine heating and thermostat function.
  3. Perform OBD checks to induce opposite DTCs (P0197) or confirm high input readings (P0198).
  4. Conduct circuit tests with KOEO to check reference voltage and sensor output.

Fixes

  • Replace the faulty EOT sensor.

FAQ

What does P0198 mean?

P0198 indicates a high input reading from the Engine Oil Temperature Sensor, suggesting potential issues with the sensor or its wiring.

How do I diagnose P0198?

Diagnose by checking electrical connections, performing OBD checks to induce opposite DTCs, and conducting circuit tests for reference voltage and output readings.

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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