Skip the auto shop - Our mechanics make house calls

Q: My check engine light came on...car isn't overheating no change in engine temp gauges..autozone used one of their testing gages sa

asked by on

My check engine light came on.I have no overheating,no change in temperture gauges and all my fluids are ok.I had Autozone do one of their test with a hand held device and was told it was a thermostat...

My car has 170000 miles.
My car has an automatic transmission.

There are several possible reasons for a check engine light to come on. Typically, when the check engine light appears, the first step is to pull the diagnostic codes out of the computer with a scan tool, like you did. The codes you get will give a mechanic an idea of where to start with the diagnostic process. A common misconception is that pulling these diagnostic codes will tell you exactly what parts need to be replaced. In reality, the codes are only a starting point for further diagnosis. I’m not saying that the thermostat does not need to be replaced, but a given code could actually have several root causes. Each diagnostic trouble code will have a test associated with it to determine exactly what is causing the code to be set. If this is something you need a hand in diagnosing and/or repairing, contact a certified mechanic, like those available at YourMechanic.com.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  • Home
  • Questions
  • My check engine light came on...car isn't overheating no change in engine temp gauges..autozone used one of their testing gages sa

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: Can a bushing was checked out and looked fine to a mechanic, can it go bad 2-3 weeks later?

Hi there: Different mechanics and automotive retailers have unique service checks before selling a car or saying that it's "OK" to sell. So it's virtually impossible for us to tell you whether or not the bad bushing should have been...

Q: It cranks but wont start

Hi there: When a cars engine will crank but won't start, it's typically caused by a fuel delivery or ignition system failure. On a 2002 Ford Focus, there are more than two dozen individual components that could possibly be faulty,...

Q: F150 running rich

The most common causes of too much fuel being delivered are: a dirty mass air flow sensor that overstates the amount of air entering the engine; a faulty oxygen sensor; a faulty coolant temperature sensor (the temperature signal is a...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.