The engine oil temperature sensor keeps track of the temperature of the engine oil at any given moment. It warns the engine control module (ECM) or powertrain control module (PCM) if the lubricant is getting dangerously hot.
The PCM will log a P0198 code if it spots the wrong signal from the engine oil temperature sensor.
The Diagnostic Trouble Code (DTC) P0198 indicates “Engine Oil Temperature Sensor Circuit High.”
Using a reference voltage provided by the PCM or ECM, the oil temperature sensor changes its internal resistance to reflect the temperature of the engine lubricant. When the engine lubricant gets hotter, the device’s resistance goes down. Conversely, as the oil cools down, the sensor’s resistance goes up.
The PCM compares the readings provided by the oil temperature sensor with those coming from other sensors. If the voltage signal sent by the sensor is too high, the computer will set the engine code P0198.
Note: The definition of code P0198 can differ according to the vehicle manufacturer. Check the appropriate repair manual or repair database for the exact code definition.
This engine code is considered moderate to severe. It’s recommended to track down the cause and fix the problem as early as possible.
The P0198 code is an engine code and a generic powertrain code. It applies to a variety of OBD-II-compliant vehicles equipped with an engine oil temperature sensor.
If you’re not confident about conducting diagnostic tests on your vehicle, it’s a good idea to bring it to a professional mechanic. Otherwise, you can proceed with diagnosing the issue yourself. Here are some videos to give you an idea of what the diagnostic process might involve:
Whether it’s the engine oil temperature sensor, its wiring, or even the PCM, you will need to remove the faulty part and install a suitable replacement.
Attempting to fix a P0198 code can become a frustrating task if you don’t have the right tools and know-how to test the oil temperature sensor. In most cases, it’s best to leave the job to professionals.
For DIYers with advanced technical knowledge and hands-on experience who prefer to diagnose and replace their vehicle’s oil temperature sensor on their own, it will be helpful to rely on the appropriate repair manual or refer to an online repair database.
Is a faulty engine oil temperature sensor the issue that triggered the code? If so, don’t put off replacing it. Driving while this sensor is malfunctioning won’t do. Knowing your vehicle’s condition will be like a guessing game, having no clue whether it’ll seize up or keep going. The best solution is to simply order a top-notch oil sensor replacement, which you can do right here at CarParts.com.
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