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Removal and Installation

Disconnect the negative battery cable. See BATTERY DISCONNECT .
With the vehicle in NEUTRAL, position on a hoist.
Remove the bolts and the exhaust manifold heat shield.

Fig 1: Removing Bolts & Exhaust Manifold Heat Shield & Torque Specifications
Courtesy of MAZDA MOTORS CORP.
Disconnect the heated oxygen sensor (HO2S) and the catalyst monitor sensor electrical connectors.

NOTE:

If necessary, lubricate the HO2S and catalyst monitor sensor with Penetrating and Lock Lubricant to aid in removal.

Fig 2: Removing HO2S & Catalyst Monitor Sensor With Special Tool & Torque Specifications

G03725027

Courtesy of MAZDA MOTORS CORP.

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.