A Loose or worn gas cap may cause Check Engine Light to illuminate.
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check engine light continues to come on about 1/2 tank full and code reads loose gas cap
Checked gas cap and is OK but light is still on
Engine Light came on. Service department hook the car up to the computer and the error message read that there was an issue with the gas cap. When checking the gas cap it was still loose not tight. Once gas cap was typing error message did not reappear.