P0199 Code - Engine Oil Temperature Sensor Intermittent

What Does P0199 Mean?

This code indicates that the PCM has received a signal from the engine oil temperature sensor that the engine has (or is currently) overheating. It also indicates that the engine should probably be turned off to investigate the cause of the code. Operating an engine that is overheating may lead to catastrophic engine failure.

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What are the common causes of P0199 ?

Depending on year, make, and model, DTC P0199 may have number of causes. Aside from a faulty EOT sensor, here are some of the most common causes:

• Extreme Cold – Using your vehicle in extreme cold can be problematic for a number of reasons, because the engine needs to be at a certain temperature to run at its most-efficient. Typically, the engine needs to run around 195-205 °F for best performance and fuel economy, but extreme cold might make it hard for the engine to even get to that temperature. Consider covering the grille to keep excess air out of the engine compartment to conserve heat, only be careful to watch that temperatures do not swing to overheating when at a standstill, for example.
• Racing and Towing – Putting your engine to its limits in the other direction can also impede engine oil cooling, which is essential for maintaining correct engine temperature. Racing and towing are two situations that can really push your engine’s cooling and lubrication system to the test. Consider adding an additional oil cooler to your setup to improve engine oil cooling.

What are the symptoms of P0199 ?

Aside from the MIL, you may not notice anything at all. On the other hand, you may notice other symptoms, such as overheating due to coolant problems, low oil level, or engine oil sludge. Lack of cabin heat might be another symptom, especially if you have thermostat problems or are driving in the extreme cold.

How do you troubleshoot P0199 ?

With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. If all testing has passed so far yet you still have the same code, check your scan tool and see if it can open and close the IMRC valve. Replace the oxygen sensor that is downstream from the catalytic converter on the side of the engine that does not contain cylinder #1. Also, if a oxygen sensor code stating "heater circuit malfunction" the sensor has most probably failed.

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