Secondary HO2S Replacement

Special Tools Required 

O2 sensor wrench, Snap-on YA8875, SP Tools 93750, or equivalent, commercially available

1. Disconnect the secondary HO2S 4P connector (A), then remove the secondary HO2S (B).
   Fig 1: Disconnecting Secondary HO2S 4P Connector And Torque Specifications

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
2. Install the secondary HO2S in the reverse order of removal.