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P0197 is a diagnostic trouble code (DTC) for "Engine Oil Temperature (EOT) Sensor Low". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $79.99. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
Engine Oil Temperature (EOT) Sensor Low
This code specifically means that the resistance value the powertrain control module (PCM) sees is low in comparison to the predefined specifications. This can possibly be due to high engine oil temperature.
The only symptom is a Check Engine Light. The EOT system is there to detect other problems with the vehicle. If the circuits of the EOT system have problems it will be unable to monitor the oil temperature.
This code most likely indicates a short to ground in the EOT electrical system. A scan tool should be used to observe sensor data to confirm this condition. Direct testing of the EOT circuits with a multimeter should be performed to pinpoint the source of the short to ground.
Each section of wiring should be isolated and tested to determine which section of wiring is damaged. This is followed by carefully inspecting the wiring harness for damage. Often, it is necessary to wiggle the suspected harness while observing the scan tool or multimeter to watch for a change in resistance value.
The code itself is not serious. It will not leave an owner stranded on the side of the road. However, if the system is left unrepaired, it is possible that severe engine damage could occur if the EOT system is unable to monitor troubles that arise with the oil temperature.
A P0197 code is a generic code that all manufacturers can use and must always retain the same definition.
Each manufacturer utilizes a different diagnostic method for the testing of this system. Even then, it is often used in performance vehicles that are designed to be driven very hard. Driving in racing conditions pushes the vehicle to the limits of its engineering beyond what an everyday driver will experience. For this reason, an EOT system is not common on most vehicles.
YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.