i have engine light on , again , it is tellin me a code of po 440 ?

code po440 evaporative emissions control system malfunction.... evaporative emissions leak ....dont get nervious its just the gas cap check it to make sure the rubber seal around the cap is not dry-rotted..I would just replace the cap with a OEM cap from your local parts store in witch the code should go away on its own after a few opening and closings of the gas cap .... hope this helps

Scanner should indicate where to start looking.