HO2S Removal Note

Remove the insulator (WU-TWC top side). (Front HO2S)
Remove the battery and battery tray. (See BATTERY REMOVAL/INSTALLATION [L3 WITH TC] ).
Remove the HO2S using the SST before removing the exhaust manifold.

Fig 1: Removing HO2S Using SST
Courtesy of MAZDA MOTORS CORP.