Heated Oxygen Sensor (Ho2S) Removal/Installation: Notes

Special Service Tool (SST) 

Mazda SST number Global SST number
49 L018 001 - O2 sensor wrench	Courtesy 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.

Fig 1: Wrapping Rag Around Heated Oxygen Sensor Airflow Hole

Courtesy of MAZDA MOTORS CORP.