I use the paid version of Torque and it works flawlessly. The only thing that would stop it is your bluetooth adapter not syncing with your phone right. I use ELM 327 (I think?) bluetooth adapter. Once paired with android I launch the app, wait a few seconds, and boom. It's absolutely breathtaking what that app can do!! I used it in my 1994 C280 as well as my 1999 C43. You can save thousands of dollars with this app and google.