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Home >> Mazda >> 2004 >> B2300 Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System >> Heated Oxygen Sensor (Ho2S) Removal/Installation >> Both Sensors
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Both Sensors

NOTE:
  • If necessary, lubricate the HO2S with lock lubricant to assist in removal.
  1. Disconnect the HO2S electrical connector.
    Fig 1: Disconnecting HO2S Electrical Connector
    G01937915Courtesy of MAZDA MOTORS CORP.
  2. Remove the heated oxygen sensors (HO2S) from the exhaust manifolds.
    • If necessary, lubricate the heated oxygen sensors to assist in removal.
    Fig 2: Removing Heated Oxygen Sensors (HO2S) From Exhaust Manifolds
    G01937916Courtesy of MAZDA MOTORS CORP.
  3. Disconnect the HO2S electrical connector.
    Fig 3: Disconnecting HO2S Electrical Connector
    G01937917Courtesy of MAZDA MOTORS CORP.
  4. Remove the heated oxygen sensors from the exhaust pipe using the Oxygen Sensor Wrench.
    • If necessary, lubricate the heated oxygen sensors to assist in removal.
    Fig 4: Removing Heated Oxygen Sensors From Exhaust Pipe
    G01937918Courtesy of MAZDA MOTORS CORP.
    NOTE:
    • Apply a light coat of anti-seize compound to the threads of the heated oxygen sensors.
  5. Install in reverse order of removal.
    1. Tightening torque: 
      1. 36-46 N.m (27-33 ft.lbs) 
    Fig 5: Installing HO2S Sensor
    G01937919Courtesy of MAZDA MOTORS CORP.
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