Removal and Installation

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

Fig 1: Exhaust Manifold Heat Shield With Torque Specifications
Courtesy of MAZDA MOTORS CORP.
Remove the bolts and the exhaust manifold heat shield.
Disconnect the heated oxygen sensor (HO2S) and the catalyst monitor sensor electrical connectors.

Fig 2: HO2S And Catalyst Monitor Sensor With Torque Specifications
Courtesy of MAZDA MOTORS CORP.
NOTE:
- If necessary, lubricate the HO2S and catalyst monitor sensor with Penetrating and Lock Lubricant to aid in removal.
Using the special tool, remove the HO2S and catalyst monitor sensor.
NOTE:
- Apply a light coat of High Temperature Nickel Anti-Seize Lubricant to the threads of the HO2S to aid in installation.
To install, reverse the removal procedure.