Rear Heated Oxygen Sensor (Ho2S) Removal/Installation

Remove the battery cover.
Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [LF] .)
Install the SST to the rear HO2S.
Remove the rear HO2S.

Fig 1: Removing Rear Heated Oxygen Sensor (HO2S)

Courtesy of MAZDA MOTORS CORP.

Install in the reverse order of removal.
Rear HO2S tightening torque

29-49 N.m {3.0-4.9 kg.fm, 22-35 ft.lbf}