2009 Lexus IS FFACTORY OEM SERVICE PROCEDURE

Air Fuel Ratio Sensor: Removal: Removal

  1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL  . Refer to REMOVAL - Step 3
  2. REMOVE ENGINE AND TRANSMISSION 
    1. Remove the engine and transmission. Refer to REMOVAL .
  3. REMOVE AIR FUEL RATIO SENSOR (for Bank 1 Sensor 1) 
    1. Disconnect the air fuel ratio sensor connector.
      Fig 1: Locating Air Fuel Ratio Sensor & Connector
      GTY148772Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Using SST, remove the air fuel ratio sensor from the exhaust manifold LH.
      • SST: 09224-00010 
  4. REMOVE AIR FUEL RATIO SENSOR (for Bank 2 Sensor 1) 
    1. Disconnect the air fuel ratio sensor connector.
      Fig 2: Removing Air Fuel Ratio Sensor From Exhaust Manifold RH
      GTY148774Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Using SST, remove the air fuel ratio sensor from the exhaust manifold RH.
      • 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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