Secondary HO2S Replacement

Special Tools Required 

O2 Sensor Wrench Snap-on S3176 or equivalent, commercially available

1. Disconnect the secondary HO2S 4P connector (A), then remove the secondary HO2S (B).
   Fig 1: Secondary Ho2S 4P Connector With Torque Specification

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