Exhaust Noise at Idle - Nissan Altima 2019
An unusual noise from the exhaust at idle on a 2019 Nissan Altima may indicate an exhaust leak, loose heat shield, or a failing exhaust component. The noise could be a rattle, hiss, or tapping sound.
Diagnosis Details
Possible Causes
Exhaust system leak (cracked manifold, blown gasket, or hole in pipe)
Loose or corroded heat shield vibrating against the exhaust
Failing catalytic converter internal structure (broken honeycomb)
Related OBD-II Codes
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What You Should Do
Inspect the exhaust system for visible damage, leaks, or loose components.
Check heat shields for rust or looseness.
Listen for changes in noise when revving the engine.
If a leak is suspected, perform a smoke test or pressure test.
For catalytic converter issues, check for diagnostic trouble codes.
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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.
