2012 Toyota Prius ThreeFACTORY OEM SERVICE PROCEDURE

Air Fuel Ratio Sensor: Removal: Removal

  1. REMOVE WINDSHIELD WIPER MOTOR AND LINK 
    1. Remove the windshield wiper motor and link. Refer to REMOVAL .
  2. REMOVE COWL BODY MOUNTING REINFORCEMENT LH  . Refer to REMOVAL - Step 7
  3. REMOVE OUTER COWL TOP PANEL SUB-ASSEMBLY  . Refer to REMOVAL - Step 8
  4. REMOVE NO. 2 CYLINDER HEAD COVER  . Refer to REMOVAL - Step 29
  5. REMOVE AIR FUEL RATIO SENSOR NO. 2 
    1. Disconnect the air fuel ratio sensor connector and clamp.
      Fig 1: Identifying Air Fuel Ratio Sensor, Connector & Clamp
      GTY234942Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Using SST, remove the air fuel ratio sensor.
      Fig 2: Identifying SST & Air Fuel Ratio Sensor
      GTY227203Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      • SST: 09224-00010 
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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.

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