General notes

WARNING: This page is about a different car, the 2006 Audi A4, 2005 Audi A4, 2004 Audi A4, 2003 Audi A4, and 2002 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

Charge air system must be properly sealed.
Always replace self-locking nuts.
Charge air hoses and pipes as well as their connections must be free of oil and grease before re-installation.
Do not assemble charge air hoses and pipes with lubricants containing oils, only coat with water (without additives) if necessary.

Note installation marks on hoses and components.
All hose connections for charge air system are secured by spring-type clamps or by connector couplings.
Install only approved clamps for securing hose connections .
Spring Type Clip Pliers or Hose clamp pliers are recommended for installing spring clamps.

For connector couplings, always note the following points:

Fig 1: Identifying Hose/Tube Retaining Tabs

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Release connector coupling by pulling securing clip - arrow -.
Disconnect the hose and line without the assistance of tools.
When assembling, make sure the retaining tabs - A - are engaged securely.