Overall, the news isn't good for owners. If the dipstick is not in tight it may cause the car to idle funny. X Research source Warning: Once the OBD system resets (which occurs after a few drive cycles or a certain number of miles, depending on the vehicle), the light will come back on if the problem has not been fixed. Not necessarily!! The Check Engine Light, also called the Malfunction Indicator Light (MIL) is a warning light (sometimes called a tell-tale) that indicates a malfunction with your vehicle (as detected by your car’s computerised engine-management system).. The check engine light should go off after you drive for several minutes if the light was caused by a loose gas cap. If your ‘check engine’ light is ON, the easiest way to diagnose this problem is to check your trouble code memory with an OBD2 scanner. The check engine light often comes on and goes off after a while. When something goes wrong in this complex collection of components and sensors, it triggers this light. Again, it might take a little while after tightening the dipstick before the light … Why Check Engine Light Due To Gas Cap Happens. 1. Now it comes on again. To clear the confusion, we need a basic understanding of what the check engine light is trying to tell us. Sometimes I restart the car but it still won't go off. My car has 137531 miles. Check the dipstick in the oil compartment of your engine to make sure it is inserted properly in the tube. Any time I notice it whiles driving, I park and close the fuel tank well but the light doesn't go off. Again, the vehicle started just fine. When the computer senses it the "check engine" light will come on. If the check engine light illuminates, it will either blink or remain constantly illuminated, depending on the problem. If your vehicles’ oxygen sensor is failing, the check engine light will most likely turn on. Pay attention to the dashboard after the check engine light experience. This incident can happen for many reasons. Read on to find out the top 10 reasons the check engine light turns on, based on CarMD data. The party is broken, the fun is spoiled already. Now you think you have to go to a mechanic. Sounds like one of those superstitions or myths, doesn't it? If the light goes off, we assume things are okay. A gas cap can cause a check engine light? Third attempt to start the car and the light remained on. What could be the cause? Knowing if we should continue driving or stop right now is difficult. Check out these four common check engine light issues! Second time starting the car (only minutes later) resulted in the Check Engine Light to come on. A check engine indicator is a malfunction-indicator light or MIL for the computer-management system. And yes, you might have to go to a mechanic. 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