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P0198 is a diagnostic trouble code (DTC) for "Engine Oil Temperature (EOT) Sensor High". 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. 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 High
This code indicates there is higher voltage than expected in one or all of the circuits involving the EOT system (low oil engine temperature).
The only symptom is the 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 power 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 performed to pinpoint the source of the short to power.
Each section of wiring should be isolated and tested to determine where the short to power is. 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 watching for a change in voltage.
This code is not likely to cause a vehicle to break down. However, there is some potential for this to occur. Anytime a PCM has full voltage (12.6 - 14.5 volts) applied to circuits that were designed for lower voltage, damage can occur. Fortunately, most modern vehicles have designed these systems to resist such damage in the event that a higher than expected voltage should occur.
A P0198 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.