Overview - Emissions Control System

Fig 1: Emissions Control System Components Location

Courtesy of AUDI OF AMERICA, LLC

1. Bolt
   • 20 Nm
2. Bracket
   • Replace if damaged
   • There are different versions. Refer to the Parts Information for the allocation.
3. Bolt

   Tightening specification and sequence. Refer to Fig 4.

4. Nut

   Tightening specification and sequence. Refer to Fig 4.

5. Bracket
   • For catalytic converter
6. Catalytic Converter
   • With front exhaust pipe
   • Protect catalytic converter from shocks and impact stress
   • Removing and Installing. Refer to CATALYTIC CONVERTER, REMOVING AND INSTALLING .
   • Exhaust System, Installing without Tension. Refer to EXHAUST SYSTEM, INSTALLING WITHOUT TENSION .
7. Screw-Type Clamp
   • 15 Nm
   • Always replace
   • Tightening specification and sequence. Refer to Fig 4.
   • Installation position. Refer to Fig 3.
8. Seal
   • Always replace
9. Turbocharger
   • Removing and installing. Refer to TURBOCHARGER .
10. Nut

    Tightening specification and sequence. Refer to Fig 4.

11. Nut
    • 23 Nm
12. Front Clamping Sleeve
    • Before tightening, align the exhaust system without tension. Refer to EXHAUST SYSTEM, INSTALLING WITHOUT TENSION .
    • Tighten threaded connections evenly.
    • Installation position. Refer to Fig 2.

Installation Position for Front Clamping Sleeve 

Fig 2: Installation Position For Front Clamping Sleeve

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-- Install the clamping sleeve in the position shown.

• Angle -α- = approximately 20°.
• Threaded connection to the right.
• The nuts are toward the top.

Installation Position of the Catalytic Converter Screw-Type Clamp 

Fig 3: Installed Location of the Catalytic Converter Screw Clamp

Courtesy of AUDI OF AMERICA, LLC

• Angle -α- = 30°.

Catalytic Converter - Tightening Specification and Sequence 

Fig 4: Catalytic Converter - Tightening Sequence

Courtesy of AUDI OF AMERICA, LLC

-- Tighten the threaded connections in steps in the sequence shown: