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Q:The 'check engine' light is on and throws a ECT2 sensor code. Is this the ECT2 sensor?
A:Yes this is a coolant temperature sensor.
Q:where is this part located on the engine and does this sensor tell the cooling fan to come on?
A:For further assistance, please provide the year, make, model and engine size of the vehicle in question.
Q:what does this sensor do and how do you know if not working?
A:This sensor measures the engine coolant temperature, and the rate of the coolant temperature change. If the sensor is bad it will trigger a trouble code and the check engine light in the dashboard will come on, you can retrieve the engine code and see if it is related to the coolant temperature sensor, even if the engine control computer doesn't store a trouble code, there is another way to suspect a bad coolant temperature sensor : If your vehicle starts using more fuel than usual, starts having trouble starting when the engine reaches normal operating temperature or you notice black smoke coming out from the exhaust tail pipe, it is very likely that these symptoms are related to a bad coolant temperature sensor