Exhaust system components, overview (vehicles with front wheel drive)
WARNING: This page is about a different car, the 2006 Audi A4, 2005 Audi A4, 2004 Audi A4, 2003 Audi A4, and 2002 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.
1 - Center muffler
- Factory installed with rear muffler as one unit. If repair is necessary, replace separately
- Cutting point. Refer to Center and rear muffler, separating
- Install exhaust system free of stress. Refer to Exhaust system, aligning free of stress (vehicles with front wheel drive)
2 - 23 Nm
3 - Support ring
- Replace if damaged
4 - 27 Nm
- Always replace
5 - Exhaust manifold
- For cylinder bank 1 (right)
- Removing and installing. Refer to Right exhaust manifold, removing and installing
6 - Gasket
- Always replace
7 - Oxygen sensor, 55 Nm
- Before catalytic converter
- For cylinder bank 1 (right)
- Only grease threads with G 052 112 A3. Do NOT allow grease to get into slots on sensor body
8 - Oxygen sensor, 55 Nm
- Before catalytic converter
- For cylinder bank 2 (left)
- Only grease threads with G 052 112 A3. Do NOT allow grease to get into slots on sensor body
9 - Exhaust manifold
- For cylinder bank 2 (left)
- Removing and installing. Refer to Left exhaust manifold, removing and installing
10 - Gasket
- Always replace
11 - 27 Nm
- Always replace
12 - Oxygen sensor, 55 Nm
- Behind catalytic converter
- For cylinder bank 2 (left)
- Only grease threads with G 052 112 A3. Do NOT allow grease to get into slots on sensor body
13 - Front exhaust pipe with catalytic converter
- For cylinder bank 2 (left)
- With decoupling element
- Decoupling element must not be bent more than 10°, otherwise it may be damaged
- Protect from hit and impact stress
- Install exhaust system free of stress. Refer to Exhaust system, aligning free of stress (vehicles with front wheel drive)
- Individual mounting components for vehicles with manual transmission. See Figure
- Individual mounting components for vehicles with automatic transmission 01J. See Figure
- Vehicles with manual transmission, removing and installing. Refer to Left front exhaust pipe with catalytic converter, removing and installing (vehicles with manual transmission)
- Vehicles with automatic transmission 01J, removing and installing. Refer to Left front exhaust pipe with catalytic converter, removing and installing (vehicles with automatic transmission 01J)
14 - Front clamping sleeve
- Before tightening ensure exhaust system is free of stress. Refer to Exhaust system, aligning free of stress (vehicles with front wheel drive)
- Installed position. See Figure
- Tighten bolts evenly
15 - 40 Nm
16 - Oxygen sensor, 55 Nm
- Behind catalytic converter
- For cylinder bank 1 (right)
- Only grease threads with G 052 112 A3. Do NOT allow grease to get into slots on sensor body
17 - Front exhaust pipe with catalytic converter
- For cylinder bank 1 (right)
- With decoupling element
- Decoupling element must not be bent more than 10°, otherwise it may be damaged
- Protect from hit and impact stress
- Install exhaust system free of stress. Refer to Exhaust system, aligning free of stress (vehicles with front wheel drive)
- Individual mounting components for vehicles with manual transmission. See Figure
- Individual mounting components for vehicles with automatic transmission 01J. See Figure
- Vehicles with manual transmission, removing and installing. Refer to Right front exhaust pipe with catalytic converter, removing and installing (vehicles with manual transmission)
- Vehicles with automatic transmission 01J, removing and installing. Refer to Right front exhaust pipe with catalytic converter, removing and installing (vehicles with automatic transmission 01J)
18 - Rear muffler
- For left side of vehicle
- Factory-installed with center muffler as one unit. If repair is necessary, replace separately
- Cutting point. Refer to Center and rear muffler, separating
- Replacing end pipes. See Figure
- Install exhaust system free of stress. Refer to Exhaust system, aligning free of stress (vehicles with front wheel drive)
19 - Support ring
- Replace if damaged
20 - 23 Nm
21 - Rear muffler
- For right side of vehicle
- Factory-installed with center muffler as one unit. If repair is necessary, replace separately
- Cutting point. Refer to Center and rear muffler, separating
- Replacing end pipes. See Figure
- Install exhaust system free of stress. Refer to Exhaust system, aligning free of stress (vehicles with front wheel drive)
22 - 23 Nm
23 - Rear clamping sleeve
- Used when center or rear muffler is replaced separately.
- Before tightening ensure exhaust system is free of stress. Refer to Exhaust system, aligning free of stress (vehicles with front wheel drive)
- Installed position. See Figure
- Tighten bolts evenly
24 - 40 Nm
25 - Support ring
- Replace if damaged
26 - 23 Nm