51 47 173 Removing and installing/replacing flap in luggage compartment trim on left

Pull release handle (1).

Open flap (2) and remove.

Fig 1: Identifying Release Handle And Flap

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note: 

Latch mechanism (1) and guide (2) must not be damaged.

Fig 2: Identifying Latch Mechanism And Guide

Courtesy of BMW OF NORTH AMERICA, INC.