Exhaust Noise at Idle Diagnosis
An unusual noise from the exhaust system at idle typically indicates a leak, loose component, or internal issue such as a failing muffler or catalytic converter. The sound may be a hiss, rumble, or rattle.
Diagnosis Details
Possible Causes
Exhaust leak at a gasket or joint (e.g., manifold, pipe connection)
Loose or damaged heat shield rattling against the exhaust
Internal failure of the muffler or catalytic converter (e.g., broken baffles or substrate)
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 and check for soot or discoloration.
Tighten loose parts or replace gaskets as needed.
If internal failure is suspected, consult a professional for further diagnosis.
Related Repairs
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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.
