The check engine light came on, can it just be that I didn't tighten the gas cap?

2012 KIA RIO
300 MILES
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SHREWS.K
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I just filled up for the first time 150 miles ago. The check engine light just came on. Could it be that I didn't tighten the gas cap? The light just came on at 150 miles after fill up.
Mar 13, 2012 at 11:23 PM
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SATURNTECH9
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It could be a lot of differnt things get the codes read and and let me know the exact code numbers not code descriptions.
Mar 13, 2012 at 11:29 PM
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SHREWS.K
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The code is p0456
Mar 14, 2012 at 9:35 PM
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SATURNTECH9
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I have very little online repair info for that car its still under warranty reset the gas cap clear the code if it comes back take it in.
Mar 14, 2012 at 10:20 PM