Fuel System, Bleeding
WARNING: This page is about a different car, the 2009 Audi A4, 2008 Audi A4, 2007 Audi A4, 2006 Audi A4, and 2005 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.
To prevent damage to the catalytic converter the fuel system must be bled after repair work on fuel lines or on the fuel filter.
Fuel system, bleeding → 24 - FUEL INJECTION SYSTEM .