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Home >> Mazda >> 2007 >> 3 Mazdaspeed, 2.3 M >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System (L3 With TC) >> Heated Oxygen Sensor (Ho2S) Inspection >> Rear HO2S Heater Resistance Inspection

Rear HO2S Heater Resistance Inspection

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

    Rear HO2S heater resistance 2-50 ohms 

    Fig 1: Identifying Rear HO2S Connector Terminals
    G04955358Courtesy of MAZDA MOTORS CORP.
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