Oxygen Sensors

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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.

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

Tightening torque using recommended tool

Torque wrench Nr.90 Pos.3 - suitable for 3/8 inch heads
Insert adapter with universal joint Nr.98-1 Pos.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.

Location	Description	Type	Basic value	Tolerance 1	Tolerance 2
Oxygen sensor to catalytic converter	During re-installation, grease thread using prescribed lubricant	Tightening torque using prescribed tool	39 Nm (29 ftlb.)