Have you tried pulling it off and cleaning it? I had the same problem on my 04. It took me 4 or 5 tries to finally get it good and clean and no more CEL, youll need a box of Q tips, toothpicks and a can or 2 of electrical cleaner. If they stayed the same, you should get a new O ring seal beforehand, mine was swelled up, and didn't want to reinstall very easy. It took me half an hour or so to pull it each time, the key is to really clean the black gunk out of the part that turns inside. It looks like a razor edge when its clean. You should be able to find a write up on the whole process easy enough. Saved me a bunch of cash...