Air Fuel Ratio (A/F) Sensor Removal/Installation: Notes

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

NOTE:

• If penetrant lubricating spray penetrates the airflow hole of the A/F sensor, it could cause interference with the A/F sensor function.
• When removing the A/F sensor, wrap a rag around the lower position so that penetrant lubricating spray does not get sprayed into the airflow hole.

Fig 1: Identifying A/F Sensor

Courtesy of MAZDA MOTORS CORP.

Fig 2: Identifying Exhaust System

Courtesy of MAZDA MOTORS CORP.

1. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .)
2. Remove the plug hole plate. (See PLUG HOLE PLATE REMOVAL/INSTALLATION .)
3. Disconnect the A/F sensor connector.
4. Remove the clip from the heat insulator.
   Fig 3: Identifying Clip And Heat Insulator

   Courtesy of MAZDA MOTORS CORP.
5. Remove the wiring harness from the wire clip A and B. (See ASSEMBLY OF WIRING HARNESS TO WIRE CLIP NOTE .)
   Fig 4: Removing Wiring Harness From Wire Clip A And B

   Courtesy of MAZDA MOTORS CORP.
6. Remove the A/F sensor using the SST  .
7. Install in the reverse order of removal.
   Fig 5: A/F Sensor And SST With Torque Specifications

   Courtesy of MAZDA MOTORS CORP.