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Front HO2S Circuit Open/Short Inspection (Sensor): Notes

WARNING: This page is about a different car, the 2007 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the PCM connector.
  2. Disconnect the front HO2S connector.
  3. Inspect the following wiring harnesses for an open or short circuit. (Continuity inspection)
    Fig 1: Identifying Front HO2S Connector Terminals
    G04955353Courtesy of MAZDA MOTORS CORP.
    Fig 2: PCM Connector Terminal Identification
    G04859829Courtesy of MAZDA MOTORS CORP.
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