Overall, the news isn't good for owners. Pay attention to the dashboard after the check engine light experience. Sounds like one of those superstitions or myths, doesn't it? If your vehicles’ oxygen sensor is failing, the check engine light will most likely turn on. My car has 137531 miles. There are numerous reasons why it might be going bad like internal leaks, using fuel with higher ethanol concentrations or burning oil. It goes off on it own and comes back after some time. Again, the vehicle started just fine. A gas cap can cause a check engine light? Now you think you have to go to a mechanic. Third attempt to start the car and the light remained on. When the computer senses it the "check engine" light will come on. And yes, you might have to go to a mechanic. The check engine light should go off after you drive for several minutes if the light was caused by a loose gas cap. To clear the confusion, we need a basic understanding of what the check engine light is trying to tell us. Malfunctioning Oxygen Sensor. Any time I notice it whiles driving, I park and close the fuel tank well but the light doesn't go off. Not necessarily!! Knowing if we should continue driving or stop right now is difficult. Check out these four common check engine light issues! 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. If the check engine light illuminates, it will either blink or remain constantly illuminated, depending on the problem. 1. What could be the cause? When something goes wrong in this complex collection of components and sensors, it triggers this light. If you find that the light keeps coming on, and goes off again once you tighten the … If your check engine light comes on, it’s best to take your vehicle to a mechanic to get it professionally diagnosed and repaired. Read on to find out the top 10 reasons the check engine light turns on, based on CarMD data. Second time starting the car (only minutes later) resulted in the Check Engine Light to come on. 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 party is broken, the fun is spoiled already. This incident can happen for many reasons. 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. But it's true! If the light goes off, we assume things are okay. Now it comes on again. Again, it might take a little while after tightening the dipstick before the light … The check engine light often comes on and goes off after a while. Why Check Engine Light Due To Gas Cap Happens. 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