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.

Fig 1: Identifying A/F Sensor, Wire Clips And Connector

Courtesy of MAZDA

1. Disconnect the negative battery cable. (Refer to NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .)
2. Disconnect the A/F sensor connector.
3. Remove the clip from the bracket.
   Fig 2: Removing Clip From Bracket

   Courtesy of MAZDA
4. Remove the wiring harness from the wire clip A and B. (Refer to ASSEMBLY OF WIRING HARNESS TO WIRE CLIP NOTE .)
   Fig 3: Identifying Wiring Harness And Wire Clip

   Courtesy of MAZDA
5. Remove the A/F sensor using the SST. 
   Fig 4: Removing A/F Sensor Using SST

   Courtesy of MAZDA
6. Install in the reverse order of removal.