Use the search box upper right corner and the google option. You will find several threads on the subject. There are several tools that will do most functions for about $200. I bought a Foxwell some time ago and it works well for me. Scan the car as a SLK 320 r170 if it is a Base or Limited, it will scan as a SLK 32 r170 if it is a SRT6. Roadsters are more of a problem as the hydraulics is different than the Mercedes.