The average cost for an engine coolant temperature sensor replacement is between $119 to $168. Labor costs are estimated between $88 to $113 while parts are priced between $31 to $55.Get a personalized estimate based on your location and specific car. Estimate does not include taxes and fees.n engine coolant temperature sensor code is not always caused by a defective sensor. It can be triggered by a defective thermostat, defective wiring, rusty coolant, or by a plugged or restricted radiator.