knocking when I turn on 2006 Mercedes-Benz R500

When I make turns there is a knocking that I can feel in the floor board.

Asked by for the 2006 Mercedes-Benz R500
I had the same problem and it was the steering knuckle. It was repaired under warranty but I do think there is a service bulletein for this.
just started having same problem after buying a 06 r500 did the new knuckle fix problem?