I can only suggest that you take the car to a good dealer - maybe two since you live in NYC. The 4Matic transmission has over 3000 parts in it and is not something the average mechanic can do anything with. Your best bet may be to have a rebuilt transmission installed if that is required. There are many reasons why the 4Matic light will come on and only a good dealer can assist. At least this is my experience - you can assume that any repair is likely to cost $1000 or more. Wish I could be more help.