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Home › Mazda › 2004 › 3 i, Automatic › Repair and Diagnosis › Engine Performance › System › Engine Control System › Front Heated Oxygen Sensor (Ho2S) Inspection › Front HO2S circuit open/short inspection (sensor) › Notes

Front HO2S circuit open/short inspection (sensor): Notes

  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)


  1. Disconnect the PCM connector.
  2. Inspect the following wiring harnesses for an open or short circuit. (Continuity inspection)
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