Muffler Overview

Muffler Overview

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

• The exhaust manifold and turbocharger are one component, Removing and installing, refer to => [ Turbocharger ] Turbocharger.






1 Bolt

• 23 Nm

2 Bracket for Exhaust System

3 Clamping Sleeve

• Before tightening, ensure exhaust system is tension-free, refer to => [ Exhaust System, Aligning ] Service and Repair

• Installed position, refer to => [ Clamping Sleeve Location ]

• Tighten bolts evenly

4 Nut

• 23 Nm

5 Bracket for Exhaust System

6 Retaining Loop

• Replace if damaged

7 Bolt

• 23 Nm

8 Suspended Mount

• Replace if damaged

9 Bolt

• 23 Nm

10 Transverse Beam

11 Gasket

• Replace

12 Nut

• 40 Nm

• Replace

• Coat turbocharger stud bolts with hot bolt paste.

• Hot bolt paste, refer to the Electronic Parts Catalog (ETKA)

13 Heated Oxygen Sensor (HO2S) (G39) and Oxygen Sensor (O2S) Heater (Z19)

• 55 Nm

• Only use hot bolt paste to grease the threads; do not let paste get onto slits of oxygen sensor body

• Hot bolt paste, refer to the Electronic Parts Catalog (ETKA)

• Removing and installing.

14 Front Exhaust Pipe with Catalytic Converter and Front Muffler

• Flex joint must not be bent more than 10° - otherwise it may be damaged

• Do not load decoupling element on cable

• Do not damage wire mesh at decoupling element

• Protect catalytic converter from shocks and impact stress

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

• Remove decoupling element guard on replacement part as late as possible

• Install exhaust system free of stress, refer to => [ Exhaust System, Aligning ] Service and Repair

15 Oxygen Sensor (O2S) after Three Way Catalytic Converter (TWC) (G130) and Heater for Oxygen Sensor (O2S) 1 after Catalytic Converter (Z29)

• 55 Nm

• Only use hot bolt paste to grease the threads; do not let paste get onto slits of oxygen sensor body

• Hot bolt paste, refer to the Electronic Parts Catalog (ETKA)

• Removing and installing.

16 Rear Muffler

• Install exhaust system free of stress, refer to => [ Exhaust System, Aligning ] Service and Repair

17 Retaining Loop

• Replace if damaged

18 Nut

• 23 Nm

Clamping Sleeve Location





- Install clamping sleeve in angled position shown.

• Threaded connections point toward the right.

• Nuts face up.

• alpha = approximately 20°