Our Sonata had a check engine light on so I ran to O'Reilly for their free diagnostics. The error was returned as a problem with the gas cap. I tried just taking the existing cap off and putting it back on but after a few days the light still wouldn't go out so I decided to just go ahead and try a new one. The replacement was easy and after a few days the light went out. I've filled a few tanks since then and no problems.
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