I too had a check engine light and yes a loose gas cap will cause this. But in my situation the gas tank valve was cracked, being the valve is molded to the tank they had to replace the entire gas tank. Just my experience. No problems since!
Doug
2003 Metalic Red H2
Adventure Series. w/navigation/Sat Radio/Winch
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Doug
2006 Pewter Luxury/Adventure Edition
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