Bit late on this thread but here's my experience with a 0442 CEL. Mine started shortly after I had the fuel pump replaced by the dealer (under warranty). Figured it had to be connected with the work but took it back twice and they were unable to find the cause because it always returned. To cut a long story short, (and by this time I had moved 1,000 miles away) the problem was eventually traced to a fuel line on the top of the fuel tank which had been nicked by the metalwork under the back seat that they had 'peeled back' to access the fuel pump. It was a tiny nick, but enough to cause the P0442.
