Check engine light on and will not go off went

if its code p0442 the most common problem is gas cap unless they reset the code for u the vehicle has to cycle- start up a few times or reset after certain amount of miles are driven--but-- this code also can b a cracked, broken,or disconnected vent line,go back to auto zone have them rescan and check for code and have them reset the trouble code if it comes back on than a problem still is present