If mechanical damage (for example a destroyed compression wheel) is found on the turbocharger, just replacing the turbocharger is not enough. To avoid subsequent damage later, perform the following steps:

WARNING: This page is about a different car, the 2022 Audi S5, 2021 Audi S5, and 2020 Audi S5. However, it is still accessible from the selected car via links, so may be relevant.

Check the air filter housing, air filter element and air duct hoses for contamination.
Check the entire charge air circuit and charge air cooler for foreign objects.
If there are foreign objects in the charge air system, clean the charge air circuit and replace the charge air cooler if necessary.
If bearing damage is apparent on the removed turbocharger, change the engine oil and filter.

When installing a new turbocharger compare the old and new components and if necessary reposition the attachments. Refer to OVERVIEW - TURBOCHARGER, 3.0L ENGINE .