Secondary HO2S Replacement

Special Tools Required 

O2 sensor socket wrench, Snap-on YA8875 or SWR2, or equivalent, commercially available

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

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