Exhaust System Overview
WARNING: This page is about a different car, the 2010 Audi Q7, 2009 Audi Q7, 2008 Audi Q7, and 2007 Audi Q7. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
After exhaust system repairs, make sure exhaust system is not under stress and is far enough from the body. If necessary, loosen clamping sleeves and align mufflers and exhaust pipes so that there is adequate distance to vehicle body, and weight is evenly distributed among the exhaust hangers.
Primary catalytic converter and main catalytic converter
- Main Catalytic Converter
- For right side of vehicle
- Protect from shocks and impact stress
- Removal and installation, refer to RIGHT MAIN CATALYTIC CONVERTER
- Install exhaust system free of stress, refer to EXHAUST SYSTEM, INSTALLING
- Gasket
- Replace
- Nut
- Tightening specification: 23 Nm
- Replace
- Primary Catalytic Converter
- For right side of vehicle
- With flex joint
- Do not bend the flex joint more than 10° or it will get damaged.
- Protect from shocks and impact stress
- Removal and installation, refer to RIGHT PRIMARY CATALYTIC CONVERTER
- Install exhaust system free of stress, refer to EXHAUST SYSTEM, INSTALLING
- Gasket
- Replace
- Exhaust Manifold
- For cylinder bank 1 (right)
- Removal and installation, refer to RIGHT EXHAUST MANIFOLD
- Nut
- Replace
- Tightening specification: 23 Nm
- Heated Oxygen Sensor (HO2S) -G39- (before catalytic converter)
- For cylinder bank 1 (right)
- Removal and installation, refer to HEATED OXYGEN SENSORS, REMOVING AND INSTALLING
- Oxygen Sensor (O2S) after Three Way Catalytic Converter (TWC) -G130-
- For cylinder bank 1 (right)
- Removal and installation, refer to HEATED OXYGEN SENSORS, REMOVING AND INSTALLING
- Nut
- Tightening specification: 23 Nm
- Replace
- Exhaust Manifold
- Cylinder bank 2 (left)
- Removal and installation, refer to LEFT EXHAUST MANIFOLD
- Gasket
- Replace
- Heated Oxygen Sensor (HO2S) 2 -G108- (in front of catalytic converter)
- For cylinder bank 2 (left)
- Removal and installation, refer to HEATED OXYGEN SENSORS, REMOVING AND INSTALLING
- Primary Catalytic Converter
- For left side of vehicle
- With flex joint
- Do not bend the flex joint more than 10° or it will get damaged.
- Protect from shocks and impact stress
- Removal and installation, refer to LEFT PRIMARY CATALYTIC CONVERTER
- Install exhaust system free of stress, refer to EXHAUST SYSTEM, INSTALLING
- Oxygen Sensor (O2S) 2 after Catalytic Converter -G131-
- For cylinder bank 2 (left)
- Removal and installation, refer to HEATED OXYGEN SENSORS, REMOVING AND INSTALLING
- Nut
- Tightening specification: 23 Nm
- Replace
- Gasket
- Replace
- Main Catalytic Converter
- For left side of vehicle
- Protect from shocks and impact stress
- Removal and installation, refer to LEFT MAIN CATALYTIC CONVERTER
- Install exhaust system free of stress, refer to EXHAUST SYSTEM, INSTALLING
- Suspended Mount
- Replace if damaged
- Bolt
- Tightening specification: 23 Nm
- Suspended Mount
- Replace if damaged
- Tightening specification: 23 Nm
- Suspended Mount
- Replace if damaged
- Bolt
- Tightening specification: 23 Nm
- Suspended Mount
- Replace if damaged
- Bolt
- Tightening specification: 23 Nm
Center Muffler and Rear Muffler
- Bolt
- Tightening specification: 23 Nm
- Suspended Mount
- Replace if damaged
- Nut
- Tightening specification: 23 Nm
- Rear Clamping Sleeve
- For individual replacement of center and rear mufflers
- Installed location, refer to Fig 4
- Before tightening, align exhaust system tension-free, refer to EXHAUST SYSTEM, INSTALLING
- Tighten threaded connections evenly.
- Nut
- Tightening specification: 23 Nm
- Rear Clamping Sleeve
- For individual replacement of center and rear mufflers
- Installed location, refer to Fig 4
- Before tightening, align exhaust system tension-free, refer to EXHAUST SYSTEM, INSTALLING
- Tighten threaded connections evenly.
- Bolt
- Tightening specification: 23 Nm
- Suspended Mount
- Replace if damaged
- Nut
- Tightening specification: 23 Nm
- Front Clamping Sleeve
- Installed location, refer to Fig 3
- Before tightening, align exhaust system tension-free, refer to EXHAUST SYSTEM, INSTALLING
- Tighten threaded connections evenly.
- Nut
- Tightening specification: 23 Nm
- Front Clamping Sleeve
- Installed location, refer to Fig 3
- Before tightening, align exhaust system tension-free, refer to EXHAUST SYSTEM, INSTALLING
- Tighten threaded connections evenly.
- Center Muffler
- Original equipment as one unit with rear muffler. For repairs, replace each separately.
- Separating point, refer to Figure - Separate exhaust pipe at separating point -arrow- using VAS 6254 at a right angle.
- Install exhaust system free of stress, refer to EXHAUST SYSTEM, INSTALLING
- Suspended Mount
- Replace if damaged
- Bolt
- Tightening specification: 23 Nm
- Suspended Mount
- Replace if damaged
- Bolt
- Tightening specification: 23 Nm
- End Pipe
- For left side of vehicle
- Replacing, refer to TAIL PIPE .
- Rear Muffler
- Original equipment as one unit with center muffler. For repairs, replace each separately.
- Separating point, refer to Figure - Separate exhaust pipe at separating point -arrow- using VAS 6254 at a right angle.
- Install exhaust system free of stress, refer to EXHAUST SYSTEM, INSTALLING .
- End Pipe
- For left side of vehicle
- Replacing, refer to TAIL PIPE .
-- Install clamping sleeves so that bolts are on bottom.
- Ends of bolts point toward outside of vehicle.
-- Install the left clamping sleeve so the bolts are at the left.
- Ends of bolts point down.
-- Install right clamping sleeve so that bolts are at top.
- Ends of screws point toward right.
- Bracket
- Bolts - Tightening specification: 23 Nm
- Bolt - Tightening specification: 23 Nm
- Bolt - Tightening specification: 23 Nm
- Bolt - Tightening specification: 23 Nm
- Tab
-- Tighten bolts -arrows- to 9 Nm.