WIS is the official technical library for Mercedes-Benz repair procedures. If EPC tells you what part you need, WIS tells you how to replace or repair it.
If you want, I can:
: Mercedes-Benz licenses the EPC, WIS, and ASRA software. The standard paid subscription for the official service, Xentry Portal, can be very expensive (e.g., $3,098 for a full year for a US consumer). Using any version of this software without a valid license is considered illegal software use. mercedes benz epc wis asra full free download