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Air Fuel Ratio Sensor: Inspection: Inspection

  1. INSPECT AIR FUEL RATIO SENSOR 
    Fig 1: Identifying Air Fuel Ratio Sensor Terminals
    GTY310410Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Check the resistance.
      1. Using an ohmmeter, measure the resistance between the terminals.

        Standard resistance

        Tester Connection Condition Specified Condition
        1 (HA1A) - 2 (+B) 20 °C (68 °F) 1.8 to 3.4 Ω
        1 (HA1A) - 4 (A1A-) Always 10 kΩ or higher

        If the resistance is not as specified, replace the air fuel ratio sensor.

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