Q: What are the symptoms of a bad coolant temperature sensor

asked by on

What are the symptoms of a bad coolant temperature sensor

My car has 196000 miles.
My car has an automatic transmission.

The coolant temperature sensor on this engine sends a feed back voltage data to the computer. The computer uses this data to monitor the engine temperature from about minus 40 degrees F to over 300 degrees F. The coolant sensor may cause the engine to run the cooling fans at the wrong time if sensor is reading too high of temperature output. The engine may run extra rich or lean if the temperature output is not correct. If engine ran too rich you may notice black smoke out of exhaust or lower than expected fuel mileage and possible fouling out of the spark plugs. If engine ran too lean then the engine may have pre ignition and hesitate on acceleration and have less power. The main thing to look for when a coolant sensor is not working correct is the engine temperature is overheating or getting hotter than it normally does. Have the engine checked for overheating. The mechanic can compare the coolant sensor reading with the actual engine temperature using a laser temperature tester and a computer to scan the engine data. If the coolant sensor is not registering correct temperature it should be replaced.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. What are the symptoms of a bad coolant temperature sensor

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Engine and low trac lights come on

Hello. There are several things that could cause the Check Engine Light to come on after getting the spark plugs replaced by the dealership. If the Check Engine Light never turned off after the original repair was completed,...

Q: I changed out the camshaft position sensor, the car is still stalling and hard to start. It now shows a different P code.

The coolant temperature sensor (CTS) in your vehicle has failed and is making the computer think that the engine is too hot. When you shut off the engine and the engine will not restart, is it because the computer thinks...

Q: When I'm driving the car pauses and when I hit the gas it comes back to life, is it the accelerator sensor?

Hi there. The APP (accelerator pedal position sensor) could cause the vehicle to pause or hesitate. A faulty TPS (throttle position sensor), a faulty MAF (mass airflow) sensor, incorrectly calculating the incoming air to the engine are also possibilities. Typically,...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...