Audi Workshop Service and Repair Manuals > A4 Mk3 > Power unit | 4-cylinder direct petrol injection engine (1.8 ltr., 2.0 ltr. 4-valve turbo), mechanics | Exhaust system | Components of exhaust system - A4 saloon, A5 Coupé

Checking exhaust system for leaks

–	Start the engine and run at idling speed.

–	Plug tailpipes (e. g. with rags or stopper) and leave plugged until the check is complete.

–	Listen for noise at connection points (cylinder head/exhaust manifold, exhaust manifold/front exhaust pipe, etc.) to locate any leaks.

–	Rectify any leaks that are found.

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