458 Engine control failure - P0442 - small evap leak

wow mine just threw this code as well. no idea what it is. car runs great.

 

I'm thinking that if you are going to remove them to test them, maybe you should just replace them. They are cheap, and will eliminate any issue if by any chance they are intermittently not working properly.
Just thinking out loud....

 

I had this problem a couple of years ago. We chased it for a while but eventually replacing a part fixed it. Let me figure out the part.

 

Looks like it was also the fuel vapor filter assembly. I’m sorry that didn’t do the trick for you. Image Unavailable, Please Login

 

Actually I remembered wrong. I read through the records and we replaced that vapor filter and the code came back so a couple months later we replaced the fuel filler neck. I think that is what fixed it.

 

From what I recall they inspected the filler neck early in the process and said it looked ok. I’m assuming that meant no sticking. Then we replaced vapor filter and then finally the filler neck. If you give me some time I can sift back through the notes again. I know how frustrating this can be.

 

Hello,
I think your problem may be related to the fuel filler neck. If there is a leak in the filler neck or pipe, evaporation will occur and you may receive a fault code due to the pressure difference.

 

Not sure on the 458 but on the 488GTB had a recall on replacing the fuel vapour separator

 

Did you check your purge valves (Wash valves) for debris? We are seeing them get contaminated with charcoal from the charcoal canister.
If you tap them on a whit towel it will look lick pepper. If the canister is contaminating the system the new valves will be damaged in the near future.