Both Sensors

NOTE:

Disconnect the HO2S electrical connector.

Fig 1: Disconnecting HO2S Electrical Connector
Courtesy of MAZDA MOTORS CORP.
Remove the heated oxygen sensors (HO2S) from the exhaust manifolds.
- If necessary, lubricate the heated oxygen sensors to assist in removal.
Fig 2: Removing Heated Oxygen Sensors (HO2S) From Exhaust Manifolds
Courtesy of MAZDA MOTORS CORP.
Disconnect the HO2S electrical connector.

Fig 3: Disconnecting HO2S Electrical Connector
Courtesy of MAZDA MOTORS CORP.
Remove the heated oxygen sensors from the exhaust pipe using the oxygen sensor wrench SST .
- If necessary, lubricate the heated oxygen sensors to assist in removal.
Fig 4: Removing Heated Oxygen Sensors
Courtesy of MAZDA MOTORS CORP.
NOTE:
- Apply a light coat of anti-seize compound to the threads of the heated oxygen sensors.
To install, reverse the removal procedure.
Tightening torque:

{36-46 N.m, 27-33 ft.lbf}

Fig 5: Installing Heated Oxygen Sensors
Courtesy of MAZDA MOTORS CORP.