WARNING: This page is about a different car, the 2009 Mercedes-Benz E350 and 2008 Mercedes-Benz E350. However, it is still accessible from the selected car via links, so may be relevant.
FG 54/88/Set B
MODEL 163, 164, 168, 171, 203, 209, 210 as of 1.9.99, 211, 215, 230, 240, 251
Use:
Unlocking tool for removing the sensors 3.0 for the Parktronic system in the bumper.