Exhaust System, Checking For Leaks
WARNING: This page is about a different car, the 2021 Audi A4 Quattro. However, it is still accessible from the selected car via links, so may be relevant.
-- Start the engine and let it run in idle.
-- Seal the tailpipes, for example, with a cloth or a plug, for the duration of the leak test.
-- Check for leaks by listening at connection areas of cylinder head/turbocharger, turbocharger/front exhaust pipe etc.
-- Repair the determined leaks.