P0118
Engine Coolant Temperature Sensor 1 Circuit High
Powertrain · Generic (all makes)System: Fuel Delivery + Electrical/Circuits
Fix within days. Damage or fuel waste builds up.
Likely causes
- Failed coolant temperature sensor (open)
- Broken wire or loose connector
What to check first
Check the connector, then replace the sensor. Hard cold starts and poor fuel economy are typical until it's fixed.
Typical repair cost
$50 – $250
Independent-shop parts and labor for the usual fix. Your price depends on the actual cause and the vehicle.
Next step
General information, not a diagnosis of your vehicle. Repair costs are typical shop ranges, not quotes.