Checking the condition of the exhaust system (Audi A4 B6)

The exhaust system is connected to the exhaust manifold using bolts and nuts. It is suspended from the bottom of the car using rubber loops with a crossbar.

1. Check the rubber loops for fragility, tears and other damage, replace them if necessary. To check, pull the loops down.

2. Check the tight fit of the bolted connections on the exhaust manifold flange.

3. Plug the muffler outlet pipe with a rag. After a while, the engine should stall. If you hear hissing sounds and the engine continues to run, this indicates a leak in the system where the hissing is heard.

4. A dull sound when releasing exhaust gases and popping sounds in forced idle mode indicate a rusty system.

5. Using a rubber hammer, tap the muffler thoroughly on all sides, including the ends. Do not be overly careful. If each blow produces a ringing sound, this means that the metal has not yet been destroyed. If, however, the tapping produces a dull sound, this is a sign that the outer layer has already weakened and will soon break.