Overview - Emissions Control System
WARNING: This page is about a different car, the 2025 Audi S3 and 2025 Audi A3 Quattro. However, it is still accessible from the selected car via links, so may be relevant.
Shown on a vehicle with AWD.
- Bolt
- 20 Nm
- Bracket
- There are different versions. Refer to the Electronic Parts Information (ETKA) for the allocation.
- Replace if damaged
- Bolt
Tightening specification and sequence. Refer to Fig 4.
- Catalytic Converter
- With front exhaust pipe
- There are different versions. Refer to the Electronic Parts Information (ETKA) 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
- 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 2.
- Tighten threaded connections evenly.
- Nut
- 23 Nm
-- Install the clamping sleeve in the position shown.
- Angle -α- = approximately 20°.
- Threaded connection to the right.
- The nuts are toward the top.
- Angle -α- = 30°.
-- 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 3) 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 |