Exhaust system, component overview: Notes
WARNING: This page is about a different car, the 2009 Audi A4, 2008 Audi A4, 2007 Audi A4, 2006 Audi A4, and 2005 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.
1 - 23 Nm
2 - Suspended mount
- Replace if damaged
3 - Center muffler
- Original equipment as one unit with rear muffler. For repairs, replace each separately.
- Separating point Separate exhaust pipes at a right angle at separating point under Center muffler and rear muffler, separating
- Install exhaust system free of stress → Exhaust system, installing free of tension
4 - 27 Nm
- Replace
5 - Exhaust manifold
- For cylinder bank 1 (right)
- Removing and installing → Right exhaust manifold, removing and installing
6 - Gasket
- Replace
7 - Front exhaust pipe with catalytic converter and front muffler
- For cylinder bank 1 (right)
- With decoupling element; Decoupling element must not be bent more than 10 ° otherwise it may be damaged
- Protect from shocks and impact stress
- Removing and installing: Vehicles with manual transmission → Right front exhaust pipe with catalytic converter (vehicles with manual transmission), removing and installing , vehicles with automatic transmission → Right front exhaust pipe with catalytic converter (vehicles with automatic transmission 09L), removing and installing
- Individual components of mounting: Vehicles with manual transmission Individual right mounting components - vehicles with manual transmission , vehicles with automatic transmission Individual right mounting components - vehicles with automatic transmission
- Install exhaust system free of stress → Exhaust system, installing free of tension
8 - Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) G130
- For cylinder bank 1 (right)
- The threads of new oxygen sensors are coated with assembly paste; the paste must not get into slots of oxygen sensor body
- When re-using old oxygen sensor, grease threads with hot bolt paste; the paste must not get into slots of oxygen sensor body; hot bolt paste
- Removing and installing → 24 - FUEL INJECTION SYSTEM
- Tighten to 55 Nm
9 - 27 Nm
- Replace
10 - Exhaust manifold
- For cylinder bank 2 (left)
- Removing and installing → Left exhaust manifold, removing and installing
11 - Gasket
- Replace
12 - Front exhaust pipe with catalytic converter and front muffler
- For cylinder bank 2 (left)
- With decoupling element; Decoupling element must not be bent more than 10 ° otherwise it may be damaged
- Protect from shocks and impact stress
- Removing and installing: Vehicles with manual transmission → Left front exhaust pipe with catalytic converter (vehicles with manual transmission), removing and installing , vehicles with automatic transmission → Left front exhaust pipe with catalytic converter (vehicles with automatic transmission 09L), removing and installing
- Individual components of mounting: Vehicles with manual transmission Individual left mounting components - vehicles with manual transmission , vehicles with automatic transmission Individual left mounting components - vehicles with automatic transmission
- Install exhaust system free of stress → Exhaust system, installing free of tension
13 - Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) G131
- For cylinder bank 2 (left)
- The threads of new oxygen sensors are coated with assembly paste; the paste must not get into slots of oxygen sensor body
- When re-using old oxygen sensor, grease threads with hot bolt paste; the paste must not get into slots of oxygen sensor body; hot bolt paste
- Removing and installing → 24 - FUEL INJECTION SYSTEM
- Tighten to 55 Nm
14 - Front clamping sleeves
- Installed location Installed position of front double clamps
- Before tightening, align exhaust system so that it is tension-free → Exhaust system, installing free of tension
- Tighten threaded connections evenly.
15 - 23 Nm
16 - Rear muffler
- Left side of vehicle
- Original equipment as one unit with center muffler. For repairs, replace each separately.
- Separating point Separate exhaust pipes at a right angle at separating point under Center muffler and rear muffler, separating
- Install exhaust system free of stress → Exhaust system, installing free of tension
17 - Suspended mount
- Replace if damaged
18 - 23 Nm
19 - Rear muffler
- Right side of vehicle
- Original equipment as one unit with center muffler. For repairs, replace each separately.
- Separating point Separate exhaust pipes at a right angle at separating point under Center muffler and rear muffler, separating
- Install exhaust system free of stress → Exhaust system, installing free of tension
20 - 23 Nm
- Replace
21 - Bracket
22 - 23 Nm
23 - Rear clamping sleeves
- For individual replacement of center and rear mufflers
- Position clamping sleeve centrally to separation point
- Installed location Installed position of rear double clamps
- Before tightening, align exhaust system so that it is tension-free → Exhaust system, installing free of tension
- Tighten threaded connections evenly.