Third attempt to start the car and the light remained on. A check engine indicator is a malfunction-indicator light or MIL for the computer-management system. Sometimes I restart the car but it still won't go off. Pay attention to the dashboard after the check engine light experience. 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 vehicles’ oxygen sensor is failing, the check engine light will most likely turn on. If the light goes off, we assume things are okay. If you find that the light keeps coming on, and goes off again once you tighten the … It goes off on it own and comes back after some time. If the dipstick is not in tight it may cause the car to idle funny. Knowing if we should continue driving or stop right now is difficult. Again, it might take a little while after tightening the dipstick before the light … Read on to find out the top 10 reasons the check engine light turns on, based on CarMD data. When the computer senses it the "check engine" light will come on. Now it comes on again. 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).. A gas cap can cause a check engine light? To clear the confusion, we need a basic understanding of what the check engine light is trying to tell us. The check engine light often comes on and goes off after a while. Overall, the news isn't good for owners. And yes, you might have to go to a mechanic. The ‘check engine’ light comes on when the engine control unit or the transmission control unit has detected a fault in the engine or transmission system. Check out these four common check engine light issues! But it's true! If your check engine light comes on, it’s best to take your vehicle to a mechanic to get it professionally diagnosed and repaired. Again, the vehicle started just fine. What could be the cause? Not necessarily!! But if the reason lies in check engine light gas cap, you are salvaged. 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. If the check engine light illuminates, it will either blink or remain constantly illuminated, depending on the problem. Why Check Engine Light Due To Gas Cap Happens. Malfunctioning Oxygen Sensor. 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. The party is broken, the fun is spoiled already. Now you think you have to go to a mechanic. 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