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2.0l - Exhaust System, Emission Controls - Engine Code(s): Caeb (avant) Audi A4 B8

Exhaust 5 illustrations ~628 words

EXHAUST MANIFOLD

The exhaust manifold and turbocharger are one component; Removing and installing, refer to TURBOCHARGER .

MUFFLER OVERVIEW

Note. The exhaust manifold and turbocharger are one component; Removing and installing, refer to TURBOCHARGER .

Scheme 19

Scheme 19: MUFFLER OVERVIEW
Scheme 19: MUFFLER OVERVIEW
  1. Rear Muffler Original equipment as one unit with center muffler. For repairs, replace each separately. Separating point Install exhaust system free of stress
  2. Nut 25 Nm
  3. Rear Clamping Sleeve Before tightening, align exhaust system tension-free Installed location (Scheme 21)Tighten bolts evenly
  4. Bolt 23 Nm
  5. Bracket
  6. Retaining Loop Replace if damaged
  7. Nut 25 Nm
  8. Front Clamping Sleeve Before tightening, align exhaust system tension-free Installed location (Scheme 20)Tighten bolts evenly
  9. Gasket Replace
  10. Nut 25 Nm
  11. Catalytic Converter Protect catalytic converter from shocks and impact stress Removing and installing Install exhaust system free of stress
  12. Nut 40 Nm Replace Coat turbocharger stud bolts with hot bolt paste. Hot bolt paste, refer to the Parts Information.
  13. Gasket Replace
  14. Heated Oxygen Sensor (HO2S) -G39- and Oxygen Sensor (O2S) Heater -Z19- Threads of new oxygen sensors are coated with assembly paste When installing a used oxygen sensor, coat threads with hot bolt paste; hot bolt paste, refer to the Parts information. Assembly paste or hot bolt paste must not get onto slots of the oxygen sensor body. Removing and installing, refer to «Removal and Installation»(/audi/a4/b8-2007-2012/remont/fuel-system/#20l-multiport-fuel-injection-engine-codes-caeb-avant)
  15. Oxygen Sensor (O2S) after Three Way Catalytic Converter (TWC) -G130- and Heater for Oxygen Sensor (O2S) 1 after Catalytic Converter -Z29- Threads of new oxygen sensors are coated with assembly paste When installing a used oxygen sensor, coat threads with hot bolt paste; hot bolt paste, refer to the Parts Information. Assembly paste or hot bolt paste must not get onto slots of the oxygen sensor body. Removing and installing, refer to «Removal and Installation»(/audi/a4/b8-2007-2012/remont/fuel-system/#20l-multiport-fuel-injection-engine-codes-caeb-avant)
  16. Front Muffler With flex joint CAUTION: Danger of damaging the decoupling element. Decoupling element must not be bent more than 10°. Do not load decoupling element on cable. Do not damage wire mesh at decoupling element. Depending on the version, there may be a front exhaust pipe installed instead of a front muffler -item 17- Removing and installing Install exhaust system free of stress
  17. Front Exhaust Pipe With flex joint CAUTION: Danger of damaging the decoupling element. Decoupling element must not be bent more than 10°. Do not load decoupling element on cable. Do not damage wire mesh at decoupling element. Depending on the version, there may be a front exhaust pipe installed instead of a front muffler Removing and installing Install exhaust system free of stress
  18. Bolt 23 Nm
  19. Suspended Mount Replace if damaged Check pretension
  20. Center Muffler Original equipment as one unit with rear muffler. For repairs, replace each separately. Separating point Install exhaust system free of stress
  21. Suspended Mount Replace if damaged Check pretension
  22. Bolt 23 Nm
  23. Exhaust Tailpipe For repairs, replace each separately Separating point between the rear muffler and the tailpipe
  24. Clamp 60 Nm

Scheme 20

Scheme 20
Scheme 20

Install clamping sleeve in angle position shown.

  1. Threaded connections point toward the right.
  2. Nuts face up.
  3. α = approximately 20°

Scheme 21

Scheme 21
Scheme 21

Install the clamping sleeve so that the ends of the bolt do not extend beyond the lower edge of the clamping sleeve.

  1. The threaded connections face downward.

FASTENER TIGHTENING SPECIFICATIONS

ComponentBolt SizeNm
A4 Sedan and A5 Coupe
Bracket for retaining loop23
Catalytic converter, nuts 1, 2
25
40 4
Exhaust tailpipe clamp60
Front clamping sleeve, nut25
Rear clamping sleeve, nut25
Suspended mount 223
A5 Cabriolet
Catalytic converter 3
25
40 4
Front clamping sleeve, nut23
Left rear clamping sleeve, nut23
Suspended mount 220
1 For bolt tightening clarification, refer to and see items -10 and 12- 2 Always replace 3 For bolt tightening clarification, refer to and see items -21 and 22- 4 Coat turbocharger stud bolts with hot bolt paste

EXHAUST SYSTEM, CHECKING FOR LEAKS

Start engine and let run at idle.

Seal the tailpipes, for example, with a cloth or a plug, for the duration of the leak test.

Check for leaks by listening at connection areas of cylinder head/exhaust manifold, exhaust manifold/front exhaust pipe etc.

Repair detected leaks.

SPECIAL TOOLS

Special tools and workshop equipment required

Scheme 22

Scheme 22: SPECIAL TOOLS
Scheme 22: SPECIAL TOOLS

Scheme 23

Scheme 23
Scheme 23
  1. Hose Clamps Up to 25 mm Dia. 3094
  2. Chain Pipe Cutter VAS 6254

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