Exhaust System Leak or Loose Heat Shield
A continuous noise from under the car in a 2019 Honda Accord is often due to an exhaust leak, a loose heat shield, or a failing exhaust component. The noise may be a rattle, hiss, or rumble.
Diagnosis Details
Possible Causes
Loose or corroded heat shield rattling against the exhaust pipe or underbody.
Exhaust system leak at a gasket, flange, or cracked pipe causing a hissing or ticking sound.
Failing catalytic converter internal structure causing a rattle or rumble.
Related OBD-II Codes
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What You Should Do
Inspect under the car for loose heat shields, exhaust leaks, or damaged components.
Tighten or replace heat shields, repair exhaust leaks, and check the catalytic converter for internal failure.
A professional inspection is recommended.
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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.
