P CODES (POWERTRAIN) P0100 - P0199 P0197

    Definition of Trouble Code P0197 - Engine Oil Temperature Sensor Low

    Trouble code P0197 is an OBD-II code that indicates a low voltage problem with the engine oil temperature (EOT) sensor. The EOT sensor monitors the engine oil temperature, ensuring that it remains within the specified range for optimal performance and longevity of the engine. When the ECU detects a low voltage signal from the EOT sensor, it triggers the P0197 code and illuminates the Check Engine Light.

    How to Diagnose Trouble Code P0197

    Before beginning the diagnostic process, gather the necessary tools: a digital multimeter, an OBD-II scanner, and a repair manual specific to your vehicle make and model. Follow the steps below to diagnose the issue:

    Step 1: Connect the OBD-II scanner to your vehicle's OBD-II port, usually located under the dashboard. Read the stored trouble codes and make a note of any related codes. Clear the codes and then test drive the vehicle to see if the P0197 code reappears.

    Step 2: Consult your vehicle's repair manual to locate the EOT sensor. It is typically found near the oil filter or within the oil pan.

    Step 3: Visually inspect the EOT sensor and its wiring for any signs of damage or corrosion. Pay special attention to the connector and wires, as these components are more susceptible to damage.

    Step 4: Use the digital multimeter to check the resistance of the EOT sensor. Refer to your repair manual for the specific resistance range for your vehicle. If the sensor's resistance is outside of the specified range, it may be faulty and require replacement.

    Step 5: If the EOT sensor appears to be functioning correctly, use the multimeter to test the voltage of the sensor's signal wire. Compare the readings with the specifications in your repair manual. If the voltage is lower than specified, there may be an issue with the wiring or the ECU.

    How to Repair Trouble Code P0197

    Once you've diagnosed the issue, follow these steps to repair the problem:

    Step 1: If the visual inspection revealed damage or corrosion, clean the connector and wiring using an electrical contact cleaner. If the damage is severe, replace the affected components.

    Step 2: If the EOT sensor's resistance was outside the specified range, replace the sensor. Ensure that the new sensor is compatible with your vehicle's make and model.

    Step 3: If the issue is with the wiring or the ECU, consult a professional technician for further assistance. Repairing or replacing the ECU requires specialized knowledge and tools.

    Step 4: Once the necessary repairs are completed, clear the trouble codes using the OBD-II scanner. Test drive the vehicle to ensure that the issue has been resolved and the Check Engine Light does not reappear.


    Trouble code P0197 indicates a low voltage problem with the engine oil temperature sensor. Diagnosing and repairing this issue requires a methodical approach, using an OBD-II scanner, a digital multimeter, and a repair manual specific to your vehicle. By following the steps outlined in this guide, you can effectively resolve the problem and ensure that your engine's oil temperature is properly regulated, maintaining optimal performance and engine longevity.

    It is important to address the P0197 trouble code as soon as possible to avoid potential engine damage due to improper oil temperature regulation. In some cases, driving with a faulty EOT sensor can lead to overheating, decreased fuel efficiency, and increased engine wear.

    While the steps provided in this guide are intended to assist you in diagnosing and repairing the P0197 code, it is always advisable to consult a professional technician if you are unsure about any part of the process or if the issue persists after attempting repairs. Proper maintenance and timely repairs are essential for the overall health of your vehicle's engine and its components.

    In conclusion, by understanding the definition, diagnosis, and repair process for trouble code P0197, you can ensure that your vehicle remains in good working condition and prevent more serious issues from arising in the future. Regularly checking and maintaining your vehicle's systems, including the engine oil temperature sensor, will help you avoid unexpected breakdowns and costly repairs.

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