Air Fuel Ratio Sensor: Removal

2009 Toyota Yaris S, 4D HatchbackSECTION Removal
  1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL 
  2. 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
      G04829163Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • You smell fuel, burning insulation, or see smoke.
  • Brakes feel soft, pull hard to one side, or make grinding noises.
  • The engine overheats, stalls repeatedly, or misfires under load.
  • You are missing required tools, torque specs, or safe lifting equipment.
  • You are not confident in the next step or safety outcome.