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This may have been covered here already but couldn’t find anything on it. My gf has a 2015 optima. After she gets gas and the car is down to just less than 3/4 full, the engine light will come on. Stays on usually til she fills it back up. We have an OBD 2 reader. Can’t remember right off what the code was but was something involving the gas cap. We’ve replaced it twice to no avail. Gonna try to plug it back up tonight and see what codes I get and I’ll post them here. Anyone else experience this? Love the car, but this little gremlin is bothering her. If it was mine I’d run it til it fell down.
Thanks in advance
 

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2011 Kia Optima
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Usually P0455- Large evap leak. If cap doesn't fix the issue, you'll need to find the leak, usually use smoke to find the problem.
 
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