How Do I Know If My Engine Temperature Sensor Is Bad?

How Do I Know If My Engine Temperature Sensor Is Bad? Poor Fuel Economy. … Irregular Temperature Readings. … Black Smoke from Your Exhaust. … Your Engine is Overheating. … Your Check Engine Light is On. What happens if you unplug the coolant temp sensor? What Happens If You Unplug The Coolant Temp Sensor? Unplugging