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HOMESERVICE MANUALSTOYOTA2020RAV4 XLE, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 25 (ENGINE CONTROL SYSTEM (A25A-FXS) - SERVICE INFORMATION)AIR FUEL RATIO SENSORINSPECTION [11/2018 - ]PROCEDURE
2020 Toyota RAV4 XLE, AWD

Inspection [11/2018 - ]: Procedure

2020 Toyota RAV4 XLE, AWDSECTION Procedure
WARNING: This page is about a different variant/trim than selected.
  1. INSPECT AIR FUEL RATIO SENSOR 
    1. for Sensor 1:
      GTY746377Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Air Fuel Ratio Sensor)
      1. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        1 (HA1A) - 2 (+B) 20°C (68°F) 1.6 to 3.2 Ω
        1 (HA1A) - 4 (A1A-) Always 10 kΩ or higher

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

    2. for Sensor 2:
      GTY747927Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Air Fuel Ratio Sensor)
      1. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        1 (HA1B) - 2 (+B) 20°C (68°F) 2 to 6 Ω
        1 (HA1B) - 4 (A1B-) Always 10 kΩ or higher

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

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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.