Air Fuel Ratio (A/F) Sensor, Heated Oxygen Sensor (Ho2S) Removal/Installation [L3 With TC]: Notes

IMPORTANT: Be aware that Oxygen sensor terminology differs between California models (3 O2 sensors) and Non-California models (2 O2 sensors). When testing/servicing oxygen sensors, refer to SYSTEM WIRING DIAGRAMS article to properly identify appropriate sensor.

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.

Remove the battery cover.
Disconnect the negative battery cable.
Remove in the order indicated in the table.
Install in the reverse order of removal.

Fig 1: View Of A/F Sensor And Heated Oxygen Sensor With Torque Specification
Courtesy of MAZDA MOTORS CORP.