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Rear Oxygen Sensor: Inspection

  1. Check the rear oxygen (A/F) sensor for deformation, cracks or other damages.
  2. Check the resistance between rear oxygen (A/F) sensor terminals.
    Fig 1: Identifying Resistance Between Rear Oxygen (A/F) Sensor Terminals 1 And 2
    G06651297Courtesy of SUBARU OF AMERICA, INC.
    Terminal No. Standard
    1 and 2 5.6+0.8-0.6 Ω (when 20°C (68°F))
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