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Thanks for posting,
The light is most likely related to an emission control issue, is it possible the gas cap was not all the way tight after getting gas? If it was just tightening it won't turn the light off you have to reset it, be sure the cap is on tight, remove the negative cable from the battery for about a minute, then see if the light turns back on after driving for a while, if it does you can just go t any of the autoparts stores like Autozone or o Reilly, Advance auto and they will help you check for diagnostic codes. Keep in mind that most emission control problems ae covered for at least 3 years or 36,000 or up to 80,000 miles in some cases, so the dealer visit may be an option for you but be aware that they will charge a diagnostic fee of around $100 and if it's not covered under warranty you'll have to pay the fee plus any repairs necessary. Before doing anything you can get the diagnostic codes like I said then come back here and I'll help you with what should be done.