51 71... Removing and installing/replacing cover for carbon canister

Version, carbon canister, side: 

Release screws (1 and 2).

Press thermal insulation (3) to one side slightly and feed out cover (4).

Fig 1: Screws Thermal Insulation And Cover

Courtesy of BMW OF NORTH AMERICA, INC.

Version, carbon canister, middle: 

Release screws (1) and remove cover (2).

Release screws (4) and remove cover (3).

Fig 2: Covers And Screws

Courtesy of BMW OF NORTH AMERICA, INC.