In case anybody is interesting (or runs into this post in the archives) the problem was the evap temp sensor. By the time they got to my car it was a quick fix. I was only away from my car for a day and a half. Fortunately, my folks left their Saab in my garage while they were on vacation. I was able to avoid driving that terrible little Toyota my dealer gave me as a loaner last time. I think they loan that thing out just to make sure you'll never buy anything but a Mercedes again. It worked on me Thanks to Steve and David for the help.