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  1. Replaced gas cap, light still on. Battery disconnected while replacing alternator. Gas cap light still on. Cause????
 

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  1. Replaced gas cap, light still on. Battery disconnected while replacing alternator. Gas cap light still on. Cause???? Visit Autoguysland to know why check engine light on but no codes if you concern.
Take a close look at the gas cap if it is tight when gas cap light on?Try getting out and tightening the gas cap or removing it from the filler neck and then putting in back on and see it work or not.
 

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Not saying this is your issue, but I had the vacuum relief valve in the gas cap fail several years ago in the wifes old 04 SES Tec. I could tell it had failed by sucking on / blowing in the valve assy in the suspect cap and comparing the results to the known good cap on my 05 Tec. New Motorcraft cap fixed the issue until the car was totaled 2 years later. If you end up replacing the cap, do not go aftermarket.... get the OEM Motorcraft cap.
 
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