Installing Lambda Sensor Downstream Of Catalytic Converter

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Visually check the sealing ring -arrow- and thread on the lambda sensor for damage.
1. 1.1. Replace lambda sensor if damaged.
Fig 1: Locating Lambda Sensor Thread
Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Fit lambda sensor.
1. 2.1. Grease thread of lambda sensor with a light coating of Optimol Paste MF (000.043.207.07) before refitting. New lambda sensors are pre-greased for installation.
2. 2.2. Fit and screw in lambda sensor by hand. → Lambda sensor upstream of catalytic converter
  
  Fig 2: Locating Lambda Sensor Of Catalytic Converter
  Courtesy of PORSCHE CARS NORTH AMERICA, INC.
3. 2.3. Make sure that the connecting cable can also turn when installing the lambda sensor.
4. 2.4. Tighten lambda sensor using accessory for torque wrench: angled open-end/ring wrench Nr.96-3 . → Tightening torque: 50 Nm (37 ftlb.) +/-8 Nm (+/-6 ftlb.)
Route black connecting cable as far as the lambda sensor and clip it into the holders. Replace tie-wraps if necessary.
Connect and lock cable plug -1- .
1. 4.1. Clip cable plug -1- and connecting cable -2- into the holder.
Fig 3: Connecting Connector For Lambda Sensor Of Catalytic Converter
Courtesy of PORSCHE CARS NORTH AMERICA, INC.