WARNING: This page is about a different car, the 2009 Mercedes-Benz E550 and 2008 Mercedes-Benz E550. However, it is still accessible from the selected car via links, so may be relevant.
FG 42/Set B
MODELS 211, 230, 240
Use/specification:
47-pin test cable for diagnosis of the SBC control module (S
ensortronic B
rake C
ontrol) in conjunction with the socket box 129 589 00 21 00.