Check Valve With Vacuum Line In Engine Compartment, Removing And Installing, 3.0L/4.0L TFSI Engine: Installing
WARNING: This page is about a different car, the 2024 Audi S6 and 2024 Audi A6 Quattro. However, it is still accessible from the selected car via links, so may be relevant.
Install in the reverse order of removal while noting the following:
Coating the vacuum line with water (not with oil) makes it easier to remove.
-- Install the engine cover. Refer to ENGINE COVER, REMOVING AND INSTALLING .