I have a 04 explorer 4.6 and code P0456 came up and wondering what it means.

 

My book dosen't show a code P0456.

However, it's in the same numerical range to be
Evaporative Emission Control System related.

I'd check the fuel cap; make sure it's seated correctly
and that the O-ring seal isn't broken.

If that dosen't help, then erase the code and see if it returns.

 

thanks ill check that out when the ol lady gets back this weekend