Heated Oxygen Sensor (Ho2S) Removal/Installation

WARNING:

A hot engine and exhaust system can cause severe burns. Turn off the engine and wait until they are cool before removing the exhaust system.

Disconnect the negative battery cable.
Remove the under cover.
Disconnect the HO2S connector.
Remove the HO2S using the Special Service Tool.
Install in the reverse order of removal.

Fig 1: Locating HO2S Connector With Torque Specifications
Courtesy of MAZDA MOTORS CORP.