Exhaust System Overview

Exhaust System Overview

• The decoupling element in the front exhaust pipe must not be bent more than 10 °, otherwise it may be damaged.

• Replace gaskets and self-locking nuts.

• After exhaust system repairs, make sure the exhaust system is not under stress and is far enough from the body. If necessary, loosen the clamping sleeve and align the muffler and exhaust pipe so that there is adequate distance to the body and that the weight is evenly distributed among the suspended mounts.

• Exhaust manifold and turbocharger are one component, removing and installing. Refer to => [ Turbocharger ] Turbocharger.






1 Bolt

• 25 Nm

2 Suspended Mount

• Replace if damaged.

3 Gasket

• Always replace.

4 Nut

• 40 Nm

• Always replace.

• Lubricate the stud bolts on the exhaust manifold with hot bolt paste (G 052 112 A3).

5 Heated Oxygen Sensor (G39)

• 55 Nm

• Bank 1, sensor 1.

• Threads of new oxygen sensors are coated with hot bolt paste (G 052 112 A3).

• When reusing the old oxygen sensor, grease only the threads with hot bolt paste; the paste must not get into the slots of the oxygen sensor body.

6 Front Exhaust Pipe with Catalytic Converter


Danger of causing damage to the decoupling element.

• Do not bend the decoupling element more than 10°.

• Do not stretch the decoupling element.

• Do not damage the wire mesh on the decoupling element.

• Protect the catalytic converter from shocks and impact stress.

• Removing and installing, refer to => [ Front Exhaust Pipe with Catalytic Converters ] Front Exhaust Pipe with Catalytic Converters.

• Install the exhaust system free of stress, refer to => [ Exhaust System, Installing ] Exhaust System, Installing.

7 Oxygen Sensor after Three Way Catalytic Converter (G130)

• 55 Nm

• Bank 1, sensor 2.

• Threads of new oxygen sensors are coated with hot bolt paste (G 052 112 A3).

• When reusing the old oxygen sensor, grease only the threads with hot bolt paste; the paste must not get into the slots of the oxygen sensor body.

8 Front Clamping Sleeve

• Tighten the nuts evenly. Tightening torque and installed position, refer to => [ Tightening Torque and Installed Dimension of the Clamping Sleeve ] Clamping Sleeve Installed Position and Tightening Torque.

9 Nut

• Tighten the nuts evenly. Tightening torque and installed position, refer to => [ Tightening Torque and Installed Dimension of the Clamping Sleeve ] Clamping Sleeve Installed Position and Tightening Torque.

10 Bracket

11 Bolt

• 25 Nm

12 Suspended Mount

13 Suspended Mount

14 Exhaust Pipe with Center and Rear Mufflers

• Original equipment as one unit with the rear muffler. For repairs, replace each separately.

• Exhaust pipe separating, refer to => [ Center and Rear Muffler, Separating ] Center and Rear Muffler, Separating.

15 Tunnel Bridge

16 Nut

• 25 Nm

17 Bolt

• 25 Nm

18 Suspended Mount

19 Bolt

• 20 Nm

20 Bracket

21 Bracket

22 Bolt

• 25 Nm