Originally Posted by wetzie

It would be great to follow this through to a fix. I am having the same code P0442 and is keeping the CEL on. The 2009 X5 3.0 is out of warranty and is sitting at 56K miles. It runs very well with no smells or hesitation. I purchased the BMWhat ap and reset the CEL and the X5 would run with no errors for several days. It starts with the check gas cap error and then later puts up the CEL a couple of days later.
I purchased a new gas cap and the problem came back quickly.
I then purchased a DMTL pump and did the replacement procedure posted from Gregg3gs.
Visually inspected the hoses and checked the connections at the wheel well side.
Looking for the next step or taking it to the dealer. MD has the worthless emissions inspection and will need to get this resolved so I can pass inspection and stop paying penalties.