Front Heated Oxygen Sensor (Ho2S) Removal/Installation

For the AT vehicles, perform the following procedure for easier access.
1. Remove the rubber hanger.
2. Remove the rear tunnel member.
3. Remove the front tunnel member.
4. Remove the catalytic converter installation nuts.
5. Remove the ATF level gauge pipe. (See AUTOMATIC TRANSMISSION REMOVAL/INSTALLATION [RC4A-EL] or AUTOMATIC TRANSMISSION REMOVAL/INSTALLATION [SJ6A-EL] )
  
  Fig 1: Front Heated Oxygen Sensor (HO2S) Replacement Components With Torque Specifications
  Courtesy of MAZDA MOTORS CORP.
Remove the front HO2S using the SST (49 T018 001).
Install in the reverse order of removal.
Front HO2S tightening torque 29-49 N.m {3.0-4.9 kgf.m, 22-36 ft.lbf}

Fig 2: Removing Front HO2S Using SST
Courtesy of MAZDA MOTORS CORP.