Q: Check engine light came on then off

asked by on July 14, 2017

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

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

How do I view caller ID?

You can choose to have caller ID displayed when someone calls your phone while you are paired to HandsFreeLink. To set up caller ID, follow these quick steps: 1. Press the Phone button. 2. Rotate the selector knob to Phone...

Engine misfiring 2003 Honda CR-V

Misfires can be caused by several things. I would first check for vacuum leaks, then I would pull the plugs to see if they need replacing. It is possible that have a fuel system concern, but I would lean more...

Check Engine light came on

An illuminated Check Engine Light can be caused by many different issues on a vehicle that is 15 years old; it could be anything from a gas cap, to a bad sensor. I recommend hiring a mechanic, such as one...

Related articles

P0370 OBD-II Trouble Code: Timing Reference High Resolution Signal A Malfunction
P0370 code means that the optical sensor has missed a number of pulses in the camshaft due to a short in the wiring harness, or a damaged PCM.
P0542 OBD-II Trouble Code: Intake Air Heater "A" Circuit High
P0542 trouble code means that there is an issue with the intake air heater “A” circuit high often due to faulty intake air relay or poor wiring
P0476 OBD-II Trouble Code: Exhaust Pressure Control Valve Range/Performance
What What the P0476 code means During the exhaust back pressure step test, the engine control module (ECM) commands and measures a preprogrammed exhaust pressure and then measures time for pressure decay during your vehicle’s engine running test. The exhaust...