What is OBD-II Code P0298 – Engine Oil Over Temperature

The OBD-II Code P0298 refers to an issue with the engine oil over temperature. As a mechanic, I have come across this code several times and have worked to solve the problem for many different clients. In this article, I will provide a comprehensive explanation of the code, what it means, and how to repair the issue.

What is OBD-II Code P0298 – Engine Oil Over Temperature?

The OBD-II Code P0298 is related to the engine’s oil over temperature. This code is set by the onboard computer system when the oil temperature rises above the normal operating range for the engine. This issue can cause serious damage to the engine and should be addressed as soon as possible.

The onboard computer system continuously monitors the engine’s oil temperature using sensors located in the engine. When the temperature rises above the normal range, the computer system will set the P0298 code. This code is an indication that there is a problem with the engine’s oil temperature, and that it needs to be addressed immediately.

What causes OBD-II Code P0298 – Engine Oil Over Temperature?

Several different factors can contribute to the over-temperature of the engine’s oil. One of the most common causes is a malfunctioning oil temperature sensor. If the sensor is not working correctly, it can give inaccurate readings, causing the engine’s oil to overheat. Another common cause is low oil levels, which can cause the engine to work harder than it should, leading to increased temperatures.

A malfunctioning thermostat can also cause the engine’s oil to overheat. If the thermostat is stuck in the closed position, it will prevent the coolant from flowing through the engine, causing the temperature to rise. Finally, a clogged radiator can also contribute to overheating by preventing the coolant from circulating through the engine.

How to Diagnose OBD-II Code P0298 – Engine Oil Over Temperature?

Diagnosing OBD-II Code P0298 typically requires the use of a diagnostic scanner tool. The tool connects to the vehicle’s onboard computer system and retrieves the code. This tool can also provide more detailed information about the issue, such as sensor readings and other parameters, which can aid in the diagnosis of the problem.

If the oil temperature sensor is suspected to be the problem, it can be tested using a multimeter. The multimeter measures the resistance of the sensor, and if the reading is outside of the recommended range, the sensor should be replaced.

Checking the oil level, radiator, and thermostat are also essential to diagnosing the issue. If the oil level is low, the engine may be working harder than necessary, leading to increased temperatures. If the radiator is clogged, the coolant will not be able to circulate through the engine properly, leading to overheating. Lastly, if the thermostat is stuck in the closed position, the coolant will not flow through the engine, leading to the same issue.

How to Repair OBD-II Code P0298 – Engine Oil Over Temperature?

Once the issue has been diagnosed, the appropriate repairs should be made. If the oil temperature sensor is faulty, it should be replaced. A low oil level should be topped off, and a clogged radiator should be flushed or replaced. A faulty thermostat should be replaced as well.

If you’re unsure how to perform any of these repairs, I would recommend taking your vehicle to a professional mechanic who can perform the repairs safely and correctly.


1. Can I drive my vehicle with code P0298?
It’s not recommended to drive with the P0298 code as it can cause serious engine damage. It’s better to get the issue addressed as soon as possible at a certified mechanic to avoid further issues.

2. How long does it take to diagnose and repair P0298?
Diagnosing P0298 typically takes about one hour, and repair time depends on the issue. Repair times can range anywhere from a few hours to a day, depending on what needs to be fixed.

3. Will P0298 cause my engine to fail?
P0298 on its own won’t cause an engine to fail, but if left untreated, the issue can cause significant damage to the engine.

4. How often should I have my vehicle’s sensors checked?
It’s recommended to have your vehicle’s sensors checked at least once a year or during routine maintenance.

5. Can P0298 be prevented?
Ensuring that your oil level is properly maintained, and you have regular maintenance of your car can help prevent P0298 from happening.


Code P0298 can be a serious issue that requires immediate attention from a professional mechanic. Understanding what causes the code and how to diagnose it can help you take action quickly and prevent further engine damage. Remember to keep up with regular maintenance and have your vehicle checked regularly to prevent issues like P0298 from happening in the first place.

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