2002 s60 obd 2 fault code 456 does anyone have a diagram of the hoses involving this code thanks d avid morgan

 

Here's a diagram from IPD's web site:

http://www.ipdusa.com/Volvo-S60-P2/E...p-74-395-5034/

The quickest thing you could do is check your fuel cap. Look for cracks in the seal. I also have a 2002 and I replaced my cap a few months back for the same problem. The cap was $10 from Autozone.