With this code and others 400 series codes, the gas cap may not be at fault. Often times the charcoal canister will be over pressurized and will split apart inside. This can be caused by, most often times, topping off your gas at the pump rather than stopping when the pump stops. The charcoal canister is built to only allow for so much fume capture before it is overwhelmed and breaks apart.
If you are a topper-offer, mention this to whoever is looking at the car and check into having the canister replaced. If it isn't this, anyone elses guess is as good as mine??
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