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Home >> Mazda >> 2022 >> CX-5 Turbo >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System (VIN Y) >> Heated Oxygen Sensor (Ho2S) Removal/Installation
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Heated Oxygen Sensor (Ho2S) Removal/Installation

Special Service Tool (SST) 

49 L018 001
O2 sensor wrench
G14466036Courtesy of MAZDA MOTORS CORP.
WARNING:
  • A hot engine and exhaust system can cause severe burns. Turn off the engine and wait until they are cool before removing the exhaust system.
CAUTION:
  • Do not allow flammable objects such as the taping for bundling the wiring harness to come into contact with the exhaust system such as the exhaust manifold and silencer which reach high temperatures. Otherwise, it could cause fire damage.
NOTE:
  • If penetrant lubricating spray penetrates the airflow hole of the HO2S, it could cause interference with the HO2S function.
  • When removing the HO2S, wrap a rag around the lower position so that penetrant lubricating spray does not get sprayed into the airflow hole.
G11435611Courtesy of MAZDA MOTORS CORP.

2WD 

G11436107Courtesy of MAZDA MOTORS CORP.
  1. Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION ).
  2. Lift up the vehicle.
  3. Remove the following parts:
    1. Plate (See EXHAUST SYSTEM REMOVAL/INSTALLATION ).
    2. Floor under cover (See FLOOR UNDER COVER REMOVAL/INSTALLATION ).
    3. Brace bar (See EXHAUST SYSTEM REMOVAL/INSTALLATION ).
  4. Disconnect the HO2S connector.
    Fig 1: Heated Oxygen Sensor, Connector And Nut With Torque Specification (2WD)
    G11436108Courtesy of MAZDA MOTORS CORP.
  5. Remove the nut.
  6. Remove the clip A from the bracket.
  7. Remove the clip B from the body.
  8. Remove the HO2S using the SST.
    Fig 2: Heated Oxygen Sensor With Torque Specification (2WD)
    G11436109Courtesy of MAZDA MOTORS CORP.
  9. Install in the reverse order of removal.

AWD 

G11436110Courtesy of MAZDA MOTORS CORP.
  1. Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION ).
  2. Lift up the vehicle.
  3. Remove the floor under cover (LH). (See FLOOR UNDER COVER REMOVAL/INSTALLATION ).
  4. Disconnect the HO2S connector.
    Fig 3: Heated Oxygen Sensor, Connector And Nut With Torque Specification (AWD)
    G11436111Courtesy of MAZDA MOTORS CORP.
  5. Remove the nut.
  6. Remove the clip A from the bracket.
  7. Remove the clip B from the body.
  8. Remove the HO2S using the SST.
    Fig 4: Heated Oxygen Sensor With Torque Specification (AWD)
    G11436112Courtesy of MAZDA MOTORS CORP.
  9. Install in the reverse order of removal.
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