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 catalytic converter the fuel system must be bled after repair work on fuel lines or on fuel filter.

Work procedure

Start engine and let engine run a few minutes at average RPM and then turn off again.

NOTE:

At the beginning, engine may run roughly due to air in fuel supply system.

Check fuel supply system for leaks.
Check DTC memory and, if necessary, erase.
Then perform a road test with at least one acceleration at Wide Open Throttle (WOT), then fuel supply system must be checked again for leaks.
Check DTC memory and, if necessary, erase it. After DTC memory is erased, a readiness code must be generated for engine control module using operating mode "Guided Fault-Finding".