Q: Q: Check engine light came on then off

asked by on

Check engine light came on 5 days ago a day later it disappeared autozone told me it was possibly my TDC sensor. As i was driving home the light went off. 4 days later i took it to a mechanic they checked the sensor out plus try to see if anything else could be wrong but they could not find anything wrong. Is there a reason why my light just came on then off? Should i be worried?

My car has 113400 miles.
My car has an automatic transmission.

The check engine light comes on when the computer detects a component or sensor is out of range with signal back to computer. The computer will put on the light and if the problem goes away for a certain amount of engine start cycles without the problem happening again may turn off the light but will still store the code in memory. If the problem is not present now then you will have to drive it until the light comes on again so it can be properly diagnosed by a (mechanic) like one from [YourMechanic].

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. Q: Check engine light came on then off

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: Bought cheap crank shaft sensor, now a code is coming on.

Hi - regarding the crankshaft sensor - if the new one (cheap or otherwise) is not causing any misfire, it is just fine for now anyway. What code is "still coming up"? That is fairly important in the diagnostic process....

Q: Car feels like it will die when stopping or taking a slow corner.

What you are describing sounds like a dirty or failing idle air control valve. The idle air control valve monitors the air intake as it is mixed with fuel prior to being injected into the engine at low speeds and...

Q: Why does my car shake uncontrollably at high speeds. Aprrox 55/60 and above.

Hello, thank you for writing in. Start with the basics, make sure your tires are properly inflated and balanced properly. The point of balancing tires is to stop them from shaking and vibrating at high speeds. If that does not...

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 Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
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.