Rear Bank (Bank 1)

WARNING: This page is about a different car, the 2013 Acura MDX, 2012 Acura MDX, 2011 Acura MDX, and 2010 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.

Raise the vehicle on a lift.
Disconnect the rear secondary HO2S 4P connector (A), and remove the harness clamps (B).

Fig 1: Identifying Rear Secondary HO2S 4P Connector And Harness Clamps
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Remove the rear secondary HO2S (C).
Install the parts in the reverse order of removal.