Overview - Emissions Control System

WARNING: This page is about a different car, the 2024 Audi A3 Quattro and 2024 Audi A3. However, it is still accessible from the selected car via links, so may be relevant.

Shown on a vehicle with AWD.

Courtesy of AUDI OF AMERICA, LLC

Bolt
- 20 Nm
Bracket
- There are different versions. Refer to the Electronic Parts Information for the allocation.
- Replace if damaged
Bolt
Tightening specification and sequence. Refer to Fig 3.
Catalytic Converter
- With front exhaust pipe
- There are different versions. Refer to the Electronic Parts Information for the allocation.
- Market-specific version: with particulate filter
- Protect 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 .
- After replacing the catalytic converter with the particulate filter an adaptation must be performed. Refer to PERFORM ADAPTATIONS AFTER COMPONENT REPLACEMENT .
Screw-Type Clamp
- Replace after removing
- Installation position. Refer to Fig 2.
- Tightening specification and sequence. Refer to Fig 3.
- 15 Nm
Seal
- Replace after removing
Turbocharger
- Removing and Installing. Refer to TURBOCHARGER, REMOVING AND INSTALLING .
Front Clamping Sleeve
- Before tightening, align the exhaust system without tension. Refer to EXHAUST SYSTEM, INSTALLING WITHOUT TENSION .
- Installation position. Refer to Fig 1.
- Tighten threaded connections evenly.
Nut
- 23 Nm

Installation position for front clamping sleeve

Fig 1: Installation Position For Front Clamping Sleeve

Courtesy of AUDI OF AMERICA, LLC

-- 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 2: Installed Location of the Catalytic Converter Screw Clamp

Courtesy of AUDI OF AMERICA, LLC

Angle -α- = 30°.

Catalytic Converter - Tightening Specification and Sequence

Fig 3: Catalytic Converter - Tightening Specification and Sequence

Courtesy of AUDI OF AMERICA, LLC

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

Step	Screw-type clamp/bolt	Tightening Specification
1.	Screw-type clamp -1-	Position above the sealing flange, align (refer to Fig 2) and tighten with 5 Nm.
2.	Bolt -2-	Tighten with 2 Nm and immediately loosen by a 90° turn
3.	Screw-type clamp -1-	Tighten to 15 Nm.
4.	Bolt -2-	Tighten to 20 Nm