Service Engine Soon 2001 Maxima

My service engine soon light came on today, went to autozone and the code is p1456 EVAP Emission Control System Very Small Leak (Positive Pressure Check) does anyone no what fixes this.

before you go looking for big problems make sure your gas cap is closed all the way. i threw a SES light once and that was the problem.

Thx BP just went and checked gas cap and it seemed to be tight, wondering if that was the problem would the light go away automatically or is there some kind of reset.

i think it checks itself every 500 miles or so. when i had my problem diagnosed the guy at autozone used the diagnostic tool to reset the SES light for me and it never came back on.