Exhaust Noise at Idle - BMW 3 Series 2019
Unusual noise from the exhaust system at idle in a 2019 BMW 3 Series. The noise may be a rattle, hiss, or rumble, often indicating an exhaust leak, loose component, or failing exhaust manifold gasket.
Diagnosis Details
Possible Causes
Exhaust manifold gasket leak or cracked manifold
Loose or damaged heat shield
Failing catalytic converter or exhaust flex pipe
Related OBD-II Codes
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What You Should Do
Inspect the exhaust system for visible leaks, loose heat shields, or damaged components.
Listen for the noise location with the engine idling.
Check for exhaust fumes inside the cabin.
If a leak is suspected, have a professional perform a smoke test or pressure test.
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Disclaimer: This AI-generated diagnosis is for informational reference only. Always consult a qualified mechanic for an in-person inspection. AutOwner is not responsible for decisions made based on this information.
