Installing Oxygen Sensor Upstream Of Catalytic Converter

→ Do not remove the plastic cap on the thread until just prior to fitting.

→ Protect oxygen sensors from impact of any kind.

→ Do not kink or twist the cables when screwing in the sensors.

→ Do not re-use dirty or damaged components.

Information 

• Before installing the oxygen sensors, check that the cover plates are fitted on the catalytic converters. 
• If not, retrofit them in accordance with Technical Information.  
• The installation is described in the PIWIS information system under → Installing Cover Plate For Exhaust Manifold .

1. Visually check the sealing ring -arrow-  and thread on the oxygen sensor for damage.
   1. 1.1. Replace oxygen sensor if damaged.
      Fig 1: Locating Oxygen Sensor Thread

      Courtesy of PORSCHE CARS NORTH AMERICA, INC.
2. Fit oxygen sensor.
   1. 2.1. Grease thread of oxygen sensor with a light coating of Optimol Paste MF  (000.043.207.07) before refitting. New oxygen sensors are pre-greased for installation.
   2. 2.2. Fit and screw in oxygen sensor by hand. →246920 REMOVING AND INSTALLING OXYGEN SENSOR UPSTREAM OF CATALYTIC CONVERTER 
      Fig 2: Locating Catalytic Converter Oxygen Sensor

      Courtesy of PORSCHE CARS NORTH AMERICA, INC.
   3. 2.3. Make sure that the connecting cable can also turn when installing the oxygen sensor.
   4. 2.4. Tighten oxygen sensor using accessory for torque wrench: angled open-end/ring wrench Nr.96-3  .

      → Tightening torque: 50 Nm (37 ftlb.) +/-8 Nm (+/-6 ftlb.) 

3. Route blue connecting cable as far as the oxygen sensor and clip it into the holders. Replace tie-wraps if necessary.
4. Fit plug connection for oxygen sensor.
   1. 4.1. Clip cable plug and connecting cable into the holder. For cylinder bank 1-3, see illustration -1-  , for cylinder bank 4-6, see illustration -1-  .
      Fig 3: Identifying Plug Connection For Right Oxygen Sensor On Inner Sill (Cylinder Bank 1-3)

      Courtesy of PORSCHE CARS NORTH AMERICA, INC.
      Fig 4: Identifying Plug Connection For Left Oxygen Sensor On Inner Sill (Cylinder Bank 4-6)

      Courtesy of PORSCHE CARS NORTH AMERICA, INC.
   2. 4.2. Connect and lock cable plug.