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Q: check yellow engine light came on but runs good on 2005 Ford Focus

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
every time i start the car and i'm checked the gas cap
(1) Answer
First thing you have to do once the check engine light comes on, is scan the car with a scanner. If you dont have a scanner you can take it to the nearest Autozone, they will do it for free, and see what code you are getting.