Q: Changed gas cap........engine light still on. What else can I do?

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Car tested for engine light on.....said gas cap.....I changed the gas cap.....Engine light is still on. This happens a lot. I have to go for inspection this month.....this grandma is desperate to get this light to go off or I will fail inspection......can't afford a mechanic.

My car has 95000 miles.
My car has an automatic transmission.

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