Engine Coolant Temperature Sensor

The engine coolant temperature sensor measures the temperature of engine coolant and transmits the data to the vehicle computer systems.

Symptoms of Wear or Failure

  • Check Engine Light may illuminate with an engine coolant temperature sensor code
  • Vehicle may be hard to start
  • Poor fuel mileage

Related Repair Advice

  • When replacing the engine coolant temperature sensor, always use a factory (or equivalent) part, inspect the electrical connections, and ensure the entire cooling system is in good working order with fresh, clean coolant
  • An 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 an overheating engine.