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Oxygen Sensor Relay: Inspection

  1. Check that the oxygen sensor relay has no deformation, cracks or other damages.
  2. Measure the resistance between oxygen sensor relay terminals.
    G08315468Courtesy of SUBARU OF AMERICA, INC.
    Terminal No. Standard
    1 and 2 1 MΩ or more
    3 and 4 93.8 - 136.4 Ω (when 20°C (68°F))
  3. Connect battery positive terminal to terminal No. 3 and battery ground terminal to terminal No. 4, and measure the resistance between oxygen sensor relay terminals.
    G08315469Courtesy of SUBARU OF AMERICA, INC.
    Terminal No. Standard
    1 and 2 Less than 1 Ω
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