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Front Oxygen (A/F) Sensor: Inspection

  1. Check that the front oxygen (A/F) sensor has no deformation, cracks or other damages.
  2. Measure the resistance between front oxygen (A/F) sensor terminals.
    Fig 1: Measuring Resistance Between Front Oxygen (A/F) Sensor Terminals
    G07662810Courtesy of SUBARU OF AMERICA, INC.
    TERMINALS RESISTANCE REFERENCE CHART

    Terminal No. Standard
    4 and 6 2.4±0.24 Ω (20°C (68°F))
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