Hi on my 1999 D1 125,000 miles I pulled a code P1448 which I found to be an evap code maybe having to do with the canister. Weird thing is this CEL is always on but on days when it rains, it goes off??? Might I have a clogged purge valve or something thats causing the CEL but when it rains, it clears the clog??? I was hoping this would help me figure out what I need to do to clear the CEL. Thanks in advance.