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Primary HO2S Replacement

Special Tools Required

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

Disconnect the primary HO2S 4P connector (A), then remove the primary HO2S (B).

Fig 1: Disconnecting The Primary HO2S 4P Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Install the primary HO2S in the reverse order of removal.