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

Version with carbon canister on side: 

Release screws (1 and 2).

Tightening torque 51 75 1AZ .

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

Fig 1: Identifying Thermal Insulation, Cover, And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Version with carbon canister in center: 

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

Tightening torque 51 75 1AZ .

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

Tightening torque 51 75 1AZ .

Fig 2: Identifying Covers And Screws

Courtesy of BMW OF NORTH AMERICA, INC.