so a few months ago my check engine light cam on as well as my cruise was blinking. i went to the dealership and they just reset my comp cuz it was the gas cap and the light wouldn't go off. so i was drving and it came on again. i really don't think it was my gas cap cuz i already had 70mi on that tank. so far i've drivin for another 2 tanks of gas and on my 3rd. is there anything i can do besides for drive another 80 miles to the dealership? i know i can just unhokk my battery but i how do i know its not the gas cap?