Car encyclopedia

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.

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