Error code

OBD2 P0199

OBD2P0199
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Engine Oil Temperature Sensor Intermittent.

Severity

moderateCan be driven, but monitor for symptoms and address promptly.

Summary

P0199 indicates an intermittent issue with the Engine Oil Temperature Sensor (EOT) circuit, which can affect how the engine control module monitors oil temperature.

Symptoms

  • Malfunction Indicator Light (MIL) illuminated
  • Engine may not reach operating temperature
  • Lack of cabin heat

Common Causes

  • Poor connection or wiring issues in the EOT sensor circuit
  • Faulty Engine Oil Temperature Sensor
  • Extreme cold weather conditions
  • Racing or towing activities stressing the engine's cooling system

Diagnosis

  1. Check electrical connectors and wire harness for damage
  2. Verify thermostat operation and engine heating properly
  3. Perform OBD checks to induce opposite DTCs (P0197, P0198)
  4. Conduct circuit tests with key ON and OFF

Fixes

  • Replace the Engine Oil Temperature Sensor

FAQ

What does P0199 mean?

P0199 indicates an intermittent issue with the Engine Oil Temperature Sensor circuit.

How do I diagnose P0199?

Diagnose by checking electrical connections, performing OBD checks to induce opposite DTCs, and conducting circuit tests.

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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