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Home >> Mazda >> 2004 >> 3 i, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System >> Middle Heated Oxygen Sensor (Ho2S) Inspection [CALIFORNIA Emission Regulation Applicable Model] >> Middle HO2S Heater Resistance Inspection

Middle HO2S Heater Resistance Inspection

  1. Disconnect the middle HO2S connector.
  2. Measure the middle HO2S resistance between terminals C and D.
    • If not within the specification, replace the middle HO2S.
    Fig 1: Identifying Middle HO2S Connector Terminals
    G00972644Courtesy of MAZDA MOTORS CORP.
  1. Middle HO2S heater resistance 2-50 ohms 
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