Removing Oxygen Sensor Upstream Of Catalytic Converter

1. Remove oxygen sensor.
   Fig 1: Identifying Special Tools Of Oxygen Sensors

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.

   → Special tools - oxygen sensors  - Accessory for torque wrench: Angled open-end/ring wrench Nr.96-3 

   → Special tools - oxygen sensors  - Accessory for torque wrench: Angled open-end/ring wrench Nr.97 

   → Special tools - oxygen sensors  - Accessory for torque wrench: Angled open-end/ring wrench for assembly Nr.98 

   → Special tools - oxygen sensors  - Torque wrench, signal-transmitting with change-over ratchet Nr.90 

→ Tightening torque: 50 Nm (37 ftlb.)