2004 Sonata Chech Engine Light Question

No I don't have a scanner and I left the gas cap too loose at the gas station.
It took about a mile, but the check engine light went on. I was right near home, so I just went about a mile so I could investigate.
Sure enough, the first thing I checked was the gas cap. (pretty easy to do since I left the fueling door open). I screwed the cap back on. (until it made the ratchet sound) The check engine light stayed on.
I then unscrewed the gas cap and screwed it back in with the car off. Check engine light was still on.
I heard there is a cycle when the car keeps showing the check engine light, but you can clear it without a scanner by disconnecting the battery? I've also heard there are drawbacks to this?
Any input would be appreciated.
Brian
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I'm not sure about Hyundai, but on my GM car it took about a dozen drive cycles to reset the light.
Disconnecting the battery works, but you often lose things like radio security, radio pre-sets, auto window stops and the like. Just be patient and it will go away.
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