Are you using a D-Kan or K-kan tool?
I've got a D-Can Bluefin and the diagnostic function doesn't work.
Silver F21 M135, Man-box, Heated Seats, HK, Adaptive Dampers, Black Panel, BBS CH-R's, Eibach Pro Springs, Drexler LSD
Please help the Mod's by using the Report Button [ ! ] where appropriate