Engine coolant temperature sensor is a device that measures the actual temperature of engine. This measurement are used by the ECM to regulate the ignition parameters and to activate radiator fan. This video provides some basic symptoms when ECT sensor fails. Related Questions: What happens when engine coolant temperature sensors fails? Why do radiator fan in my car always ON? How to replace a engine coolant sensor? Can i drive with bad engine coolant temperature sensor? Can a bad coolant sensor cause your car to overheat? Related DTC codes: P0115, P0116, P0117, P0118, P0119, etc... Thanks for watching... Music from #inaudio: https://inaudio.org/track/news-corporate