Primary HO2S Replacement

Special Tools Required 

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

1. Disconnect the primary HO2S 4P connector (A), then remove the primary HO2S (B).
   Fig 1: Removing Primary HO2S

   
2. Install the primary HO2S in the reverse order of removal.