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Front HO2S heater resistance inspection

WARNING: This page is about a different car, the 2004 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the front HO2S connector.
  2. Measure the resistance between front HO2S terminals C and D.
    1. Front HO2S heater resistance 1-10 ohms [20 °C {68 °F}] 
      Fig 1: Identifying Front HO2S Connector Terminals
      G00972633Courtesy of MAZDA MOTORS CORP.


  1. Disconnect the front HO2S connector.
  2. Measure the resistance between front HO2S terminals C and D.
    • If not within the specification, replace the front HO2S.
    1. Front HO2S heater resistance 2-50 ohms 
      Fig 1: Identifying Front HO2S Connector Terminals
      G00972639Courtesy of MAZDA MOTORS CORP.
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