Why Mercedes should be done by a technician who is SCN certified? Benz Scn Coding Online coding allows the correct configuration to be loaded into the car. Without SCN coding it would take significantly longer to change any control unit, which would result in wrong configurations, and thus the cost of repair (or re-repair) would go up and up as systems got more complicated.
Unauthorized technicians cannot fix this issue because only expert technicians can access the Mercedes-Benz server. Because if you are feeling trouble with your transmission in your Benz, there is a good chance that the problem is with your ME Control Unit and that SCN coding is required to resolve the issue.