Front exhaust system

NOTE:

The front exhaust system for cylinder bank 1 (right) is shown in the illustration.

Fig 1: Exhaust System, Component Overview

Courtesy of VOLKSWAGEN UNITED STATES, INC.

1 - Nut

2 - Gasket

3 - 23 Nm

4 - Gasket

5 - Nut

6 - Gasket

7 - Heated Oxygen Sensor (HO2S) 2 G108 (in front of catalytic converter)

For exhaust bank II (cylinder 4, 5)
Threads of new oxygen sensors are coated with assembly paste
When re-installing a used oxygen sensor, coat threads with hot bolt paste; hot bolt paste
Assembly paste or hot bolt paste must not get onto slots of sensor body.

8 - Rear exhaust manifold with catalytic converter

For exhaust bank II (cylinder 4, 5)
Protect from shocks and impact stress
Removing and installing: Left → Left Exhaust System Tract, Removing and Installing , right → Right Exhaust System Tract, Removing and Installing .

9 - Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) G131

For exhaust bank II (cylinder 4, 5)
Threads of new oxygen sensors are coated with assembly paste
When re-installing a used oxygen sensor, coat threads with hot bolt paste; hot bolt paste
Assembly paste or hot bolt paste must not get onto slots of sensor body.

10 - 23 Nm

11 - Gasket

12 - Front muffler

With flex joint
Do not bend decoupling element more than 10 or it could be damaged.
Removing and installing: Left → Left Front Muffler, Removing and Installing , right → Right Front Muffler, Removing and Installing
Install exhaust system free of stress → Exhaust System, Installing

13 - Y pipe

With flex joint
Do not bend decoupling element more than 10 or it could be damaged.
Removing and installing: Left → Left Y-Pipe, Removing and Installing , right → Right Y-Pipe, Removing and Installing
Install exhaust system free of stress → Exhaust System, Installing

14 - 23 Nm

15 - Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) G130

For exhaust bank I (cylinder 1, 2, 3)
Threads of new oxygen sensors are coated with assembly paste
When re-installing a used oxygen sensor, coat threads with hot bolt paste; hot bolt paste
Assembly paste or hot bolt paste must not get onto slots of sensor body.

16 - Gasket

17 - Front exhaust manifold with catalytic converter

For exhaust bank I (cylinder 1, 2, 3)
Protect from shocks and impact stress
Removing and installing: Left → Left Exhaust System Tract, Removing and Installing , right → Right Exhaust System Tract, Removing and Installing .

18 - Heated Oxygen Sensor (HO2S) G39 (before catalytic converter)

For exhaust bank I (cylinder 1, 2, 3)
Threads of new oxygen sensors are coated with assembly paste
When re-installing a used oxygen sensor, coat threads with hot bolt paste; hot bolt paste
Assembly paste or hot bolt paste must not get onto slots of sensor body.