Removal and Installation

With the vehicle in NEUTRAL, position on a hoist. See LIFTING .
Disconnect the negative battery cable. See BATTERY DISCONNECT .

Fig 1: Removing Retainers And LH Splash Shield
Courtesy of MAZDA MOTORS CORP.
Remove the 7 retainers and the LH splash shield.
Tightening Torque:

10 Nm {1.0 kgf-m, 89 in-lbf}
Disconnect the heated oxygen sensor (HO2S) and the catalyst monitor sensor electrical connector.
NOTE:
- If necessary, lubricate the HO2S and catalyst monitor sensor with penetrating and lock lubricant to aid in removal.
  
  Fig 2: Removing HO2S And Catalyst Monitor Sensor
  Courtesy of MAZDA MOTORS CORP.
Using the exhaust gas oxygen sensor socket SST , remove the HO2S and the catalyst monitor sensor.
NOTE:
- Apply a light coat of high temperature nickel anti-seize lubricant to the threads of the HO2S and the catalyst monitor sensor to aid in installation.
Tightening Torque:

48 Nm {4.9 kgf-m, 35 ft-lbf}
To install, reverse the removal procedure.