Sorry, I over-looked the P2 question. My first attempt to add 16, did not seem successful after I re-read a thread titled 1999 W210 E320 A/C problems. Just like this user, when I first attempted to read the P2, the screen flashed erratically and I was not able to read the code. On my second attempt, I was able to read the screen as 136. I then added 16. Thanks for your help on this!