Make sure that your car is off at the gas station before you refuel. (In most areas, it is illegal (fire hazard) to have your car running/on while refueling.) If the car is on and your gas cap is removed for refueling, the car may detect a leak in the evaporative/emission control system, and throw a code that triggers the check engine light.
Similarly, If you don't properly close your gas cap after you refuel, your car may throw a similar leak code. If you don't hear a few clicks when you turn the gas cap, it may not be tight enough. Sometimes the tether for the gas cap gets in the way of the gas cap making a nice seal (it hides under the cap), so make sure that it is out of the way while tightening the gas cap. Some gas caps get a little beat up, and perhaps yours needs replacing so that may be the only way to get a good seal. (Gas caps should be
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Why my Toyota corolla engine light come on after going to gas station?
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