Oxygen Sensors

Fig 1: Overview Of Oxygen Sensors (Cylinder Bank 4-6)

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Fig 2: Overview Of Oxygen Sensors (Cylinder Bank 1-3)

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

1. Oxygen sensor downstream of catalytic converter → Tightening torque: 42 Nm (31 ftlb.)+5 Nm (+3.5 ftlb.) 
2. Oxygen sensor upstream of catalytic converter → Tightening torque: 42 Nm (31 ftlb.)+5 Nm (+3.5 ftlb.) 
3. Holder
4. Fastening screw → Tightening torque: 10 Nm (7.5 ftlb.) 
5. Small retaining clip
6. Large retaining clip

Tightening torque using recommended tool 

1. Torque wrench Nr.90 Pos.3  - suitable for 3/8 inch heads
2. Insert adapter with universal joint Nr.98-1 Pos.3 
3. Open ring wrench Nr.96-3  , width across flats: 22 mm

Fig 3: Identifying Oxygen Sensors Tools

Courtesy of PORSCHE CARS NORTH AMERICA, INC.