Air Fuel Ratio (A/F) Sensor 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.

Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
Remove the following parts:
1. Plug hole plate (See PLUG HOLE PLATE REMOVAL/INSTALLATION .)
2. Cowl panel (See COWL PANEL REMOVAL/INSTALLATION .)
3. Front under cover No. 2 (See FRONT UNDER COVER No. 2 REMOVAL/INSTALLATION .)
4. Insulator (See EXHAUST SYSTEM REMOVAL/INSTALLATION .)
Set the PCM component aside using the following procedure: (See PCM COMPONENT INSTALLATION NOTE .)
1. Remove the clip and bolt shown in the figure and set the ground cable aside.
  
  Fig 1: PCM Component, Ground Cable, Clip And Bolt
  Courtesy of MAZDA MOTORS CORP.
2. Remove the bolts and connector shown in the figure.
  
  Fig 2: PCM Component, PCM Wiring Harness, Connector And Bolts
  Courtesy of MAZDA MOTORS CORP.
3. Move the PCM component in the direction of the arrow shown in the figure and set it aside with the PCM connectors connected.
Fig 3: Moving PCM Component
Courtesy of MAZDA MOTORS CORP.
Disconnect the A/F sensor connector.
Remove the A/F sensor using the SST.

Fig 4: Removing A/F Sensor Using SST
Courtesy of MAZDA MOTORS CORP.
Install in the reverse order of removal.