Heated Oxygen Sensor (Ho2S) Removal/Installation

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 wiring harness to come into contact with the exhaust manifold and silencer.

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.

Fig 1: Identifying Wrap Rag And Airflow Hole

Courtesy of MAZDA MOTORS CORP.

1. Disconnect the negative battery cable. (Refer to NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
2. Lift up the vehicle.
3. Remove the insulator. (Refer to EXHAUST SYSTEM REMOVAL/INSTALLATION .)
4. Disconnect the HO2S connector.
   Fig 2: Disconnecting HO2S Connector

   Courtesy of MAZDA MOTORS CORP.
5. Remove the clip from the body.
6. Remove the HO2S using the SST  .
   Fig 3: Removing HO2S

   Courtesy of MAZDA MOTORS CORP.
7. Install in the reverse order of removal.