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i am not 100% sure but i believe you just need to replace the gas cap cause if the cap isn't working it will cause the check engine light to come on and also will help make your car fail emissions test

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Q: Check gas cap light came on your 2001 ford focus DOHC what may be the problem and then the check engine light also turned on an it idles rough seems like an old car about to break down any ideas?
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