Why would check engine light come on and then go off?
Worn-out spark plugs can affect your engine’s combustion process and throw it all out of whack. It can also lead to a check engine light on and off intermittently. The thing about bad spark plugs is that, initially at least, you’re going to be able to continue to drive around with them.
How long before check engine light goes off after gas cap?
As soon as it’s safe, pull over and make sure your gas cap is tight. Once you’re back on the road, your check engine light should go off within 10 or 20 miles.
Is check engine light serious?
The check engine light — more formally known as the malfunction indicator lamp — is a signal from the car’s engine computer that something is wrong. If the light begins flashing, however, it indicates a more serious problem, such as a misfire that can quickly overheat the catalytic converter.
Will a new gas cap Turn off check engine light?
If so, a simple gas cap replacement may be able to solve your problem. The check engine light should go off after you drive for several minutes if the light was caused by a loose gas cap.
Can you reset your check engine light?
You may also need to manually reset the light after making repairs if the code doesn’t clear automatically. The best way to reset a check engine light is to use a code scanner. However, if your vehicle was manufactured before 1996, you can simply disconnect the battery to reset the light.
What should I do if my check engine light comes on?
My rule of thumb is to run a tank or two of gas through the car once the light comes on. If the light doesn’t go off then I take it in. That many miles it most likely is one of the emissions control devices. Expensive to replace and do not really make the car run better. The other thing is, and I chase electronic problems all the time.
Why is the Check Engine light on on my Jetta?
The system had detected the imminent failure of the bulb and was warning you. On my Jetta, what sometimes happens is that you’ll get a check engine light if you forget to put the gas cap back on, or don’t put it on tight enough, before you start the engine.
Why is the Check Engine light on on my Forester?
The check engine light stayed on for a few days, then went out on its own. My Forester has had the same engine light pop for vapour issues more times than I can count, recently caused because the gas station idiot replacing the gas cap managed to completely fail at the task.
Why does the Check Engine light keep blinking?
When the ECU ( engine control unit) detects a problem that it is unable to regulate, it then turns on the check engine light on your dashboard. This check light will either keep on glowing or will blink, depending on the nature of the fault. If the engine check is on regularly then it means that there is a problem but not an emergency.