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Discussion Starter #1
the check engine light on my 2006 sonata came on went to auto zone and advanced auto did a double check both said bad gas cap so i replaced cap drove car and 3 days later back on same code what else could this be dont change how it runs has 128500 miles runs great any sugestions on this problem
 

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What was the exact code in "Pxxxx" format ?

There is no "gas cap" code applicable to Hyundai... only various EVAP leak codes, only meaning the system wont hold due to a leak some where that could allow HC vapor into atmosphere.. you jut have to find the source of the leak and repair.
 

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Discussion Starter #6
check engine light still on

well car is in dealership on recall on rear frame rot anyway the mechanic said that he sees that fuel is leaking top of tank said the tank is plastic and on top there is a peice thats metal is what causes leak but you gotta replace whole tank assembly they have had dozens for same thing in car years from 2005 to 2008 but no recall but its a 1500 dollar job minum this should be fixed with allother issues on the rust up in rear side of frame
 
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