A check engine light can give you headaches if you aren’t careful with how you handle it. In fact, the biggest mistake that drivers make is ignoring it or waiting too long to have it fixed. Next time you notice an illuminated check engine light, be curious and try to fix the problem as soon as you can. In some cases, it isn’t even a problem with the engine and can be as minor as a loose gas cap.  Common Reasons for Check Engine Light  Loose, damaged, or missing gas cap -  Make sure you tighten this every time you fill up! Failing Sensors - An oxygen sensor or mass airflow sensor replacement is sometimes all it needs.  Worn Spark Plugs - If your vehicle is misfiring, it is probably due to old spark plugs. Overheating Catalytic Converter - A strained catalytic converter can cause hazardous fumes to leak. Be careful with this one! When a check engine light appears on your dash, one of the first things you should do is to check if your gas cap is fasten ... read more