Air Fuel Ratio Sensor: Removal

WARNING: This page is about a different car, the 2008 Toyota Yaris. However, it is still accessible from the selected car via links, so may be relevant.

DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
REMOVE AIR FUEL RATIO SENSOR
1. Disconnect the air fuel ratio sensor connector and clamp.
2. Using SST, remove the heated oxygen sensor.
  SST 09224-00010
  
  Fig 1: Identifying Air Fuel Ratio Sensor Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002