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Home >> Mazda >> 2009 >> 5 Touring, 2.3 L >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System (L3) >> Heated Oxygen Sensor (Ho2S) Inspection [L3] >> HO2S Heater Resistance Inspection

HO2S Heater Resistance Inspection

  1. Disconnect the HO2S connector.
  2. Measure the HO2S resistance between terminals C and D.
    • If not within the specification, replace the HO2S.

      HO2S heater resistance 

      2-50 ohms 

      Fig 1: Identifying Heated Oxygen Sensor Connector Terminals
      G05543256Courtesy of MAZDA MOTORS CORP.
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