That’s to make them so simple that an idiot can understand that something is wrong. In the car world, the malfunction indicator lights are commonly known as idiot lights. Take the car for a test drive and see if the code comes back.Symptoms of a failing Engine Coolant Temperature Sensor Once you repair the problem, clear the codes.If these readings don’t match, you need to inspect the connectors and wiring.The typical temperature should be around 200-degrees Fahrenheit. You should take a manual reading and compare it with an infrared thermometer. Check the coolant temperature sensor with your scan tool.Listen to the cooling fan to see if it is stuck on.You can check the coolant levels even if the hose gets hot right away.Double-check the coolant level and condition, as contaminated coolant can cause a sticking thermostat.If both hoses are the same temperature, it could be a thermostat stuck open. One of the hoses from the radiator, should be cold until the engine temperature reached full temperature, and then slowly open. Be aware of any moving parts, which can result in serious injuries! If it doesn’t get warm or it warms up slowly, the thermostat is to blame. Use caution because this hose should get very hot. Start the engine and put your hand on the radiator hose. Start with the engine coolant thermostat.Here are the steps that a professional mechanic will take to diagnose the P0128 engine code. There are times when a thermostat won’t fix the trouble code, so it’s important to ensure it needs to be changed first. You want to ensure the coolant level is good first of all. However, you don’t ever want to jump to conclusions and replace the thermostat without a complete diagnosis. In fact, it’s considered the most frequent repair for the fault. The majority of mechanics will agree that the most obvious cause of P0128 is a defective thermostat. RELATED: 6 Causes of a Cold Lower Radiator Hose (& How to Fix it ) Common P0128 Diagnosis Mistakes
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