WARNING: This page is about a different car, the 2011 Acura TL, 2010 Acura TL, and 2009 Acura TL. However, it is still accessible from the selected car via links, so may be relevant.
Disconnect the rear A/F sensor 6P connector (A), then remove the A/F sensor (B).
Fig 1: Rear A/F Sensor 6P Connector And A/F Sensor With Torque Specifications
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Install the parts in the reverse order of removal.