00 00... Exhaust system: checking condition, suspension, for leaks: Routing
WARNING: This page is about a different car, the 2003 BMW 525i, 2002 BMW 525i, and 2001 BMW 525i. However, it is still accessible from the selected car via links, so may be relevant.
Check that exhaust system is correctly routed and free of obstructions on the underbody.