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: My A/C only blows cold on recirculate

Hello. You will always get colder air when on recirculate. When taking in the outside air the A/C system will be able to drop the temperature coming in by about 20 to 30 degrees. This means if the outside air...

Q: Door sensor broken

Hi. Yes, the door sensor is connected to the alarm system and will sound the alarm when activated. Have a technician inspect the electrical components as well as the anti theft system for faults before ordering the repair. This may...

Q: My temperature is reading cold, almost to the bottom. Is this normal?

Hey there. The cold reading could mean that your thermostat is stuck open or the cooling fan is running all of the time. It could also mean a problem with the sender or gauge. Have a mechanic diagnose the cause...

Related articles

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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...