You probably think about your gas cap approximately, never. It’s a silent hero of the fuel system, until something goes wrong. If your gas cap has an issue, it will usually cause a Check Engine Light to appear. When this happens, it either needs to be tightened or replaced.
Watch Tim from AutoZone explain how to check your gas cap and determine if a replacement is needed.
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Make sure your vehicle is properly secured before performing any automotive work. Wear safety gear as recommended. These videos are intended as an instructional guide for repair. You may encounter slightly different situations with any individual vehicle. Always capture and dispose of or recycle toxic chemicals properly.