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Front HO2S heater resistance inspection

WARNING: This page is about a different car, the 2005 Mazda 6. 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.
    • If not within the specification, replace the front HO2S. (See EXHAUST SYSTEM REMOVAL/INSTALLATION .)

      Front HO2S heater resistance 

      1-10 ohms 

      Fig 1: Identifying Connector Terminal
      G03644182Courtesy of MAZDA MOTORS CORP.
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