Code Definition

P0199 — Engine Oil Temperature Sensor Intermittent

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0199

P0199 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0199 is stored, the module has detected a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0199 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The P0199 fault code is set when the Engine Control Module (ECM) detects intermittent readings or signal disruptions from the engine oil temperature sensor. This sensor is essential for measuring the temperature of the engine oil, which influences the oil's viscosity and its ability to lubricate the engine effectively. Intermittent issues with the sensor can lead to erratic temperature readings, potentially causing the ECM to receive inconsistent data. This can result in fluctuations in engine performance and may affect the overall health of the engine. Causes of intermittent sensor signals ca...

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