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

WARNING: This page is about a different car, the 2021 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

Special Service Tool (SST)

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

Courtesy of MAZDA MOTORS CORP.

Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION (US) .)
Disconnect the A/F sensor connector.
Remove the clip from the heat insulator.

Courtesy of MAZDA MOTORS CORP.
Remove the wiring harness from the wire clip A and B. (See Assembly of Wiring Harness to Wire Clip Note .)

Courtesy of MAZDA MOTORS CORP.
Remove the A/F sensor using the SST.

Fig 1: Air Fuel Ratio sensor With Torque Specification
Courtesy of MAZDA MOTORS CORP.
Install in the reverse order of removal.