My 09 Focus had a specific warning light that came on first for a loose gap before triggering the CEL. Our 05 Odyssey also threw up a warning down on the dash about the gas cap before triggering the CEL (the Ford I found out by reading the owners manual 
the Odyssey was my wife’s fault)
In this catagory people can not figure out what check charging system means.
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Rip off dealer price for a gas cap? A joke?