Removing Oxygen Sensor Upstream Of Catalytic Converter

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2013 Porsche 911, 2012 Porsche 911, 2011 Porsche 911, 2010 Porsche 911, and 2009 Porsche 911. However, it is still accessible from the selected car via links, so may be relevant.

Information

Specifications for wrench sizes (a/f specifications) for screw heads are described as follows:

Torx screws: (E..) for external Torx, (T..) for internal Torx.
Hexagon-head bolts (internal and external hexagon): Wrench size (a/f)

Information

Always expose oxygen sensor wire far enough for it to be able to turn when unscrewing the sensor.

Observe instructions when working with oxygen sensors.
→ 2400AW PRECAUTIONARY MEASURES WHEN HANDLING OXYGEN SENSORS .
Pull plug connection for oxygen sensor upstream of catalytic converter (blue cable) -1- in the engine compartment out of the bracket.
1. 2.1. Release and pull off cable plug.
2. 2.2. Plug connection on cylinder bank 1-3:
  
  Fig 1: Identifying Oxygen Sensor Connectors And Cylinder Bank 1-3
  Courtesy of PORSCHE CARS NORTH AMERICA, INC.
3. 2.3. Plug connection on cylinder bank 4-6:
  
  Fig 2: Identifying Oxygen Sensor Connectors And Cylinder Bank 4-6
  Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Guide the oxygen sensor cable at the side of the engine to the catalytic converter and unclip the cable from the left holder -arrow- .
Loosen and unscrew oxygen sensor upstream of catalytic converter (a/f 22) -1- .

Fig 3: Locating Catalytic Converter Oxygen Sensors
Courtesy of PORSCHE CARS NORTH AMERICA, INC.