Auto Systems and Repair: Engine Coolant Temperature Sensor
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.