Exhaust System Leak or Heat Shield Rattle
A continuous noise from under the car on a 2020 Toyota Camry is often due to an exhaust leak, a loose heat shield, or a failing exhaust component. The sound may be a rattle, hiss, or hum that persists regardless of driving conditions.
Diagnosis Details
Possible Causes
Loose or corroded heat shield vibrating against the exhaust pipe or underbody.
Exhaust system leak at a joint, gasket, or cracked pipe (e.g., exhaust manifold, catalytic converter, or muffler).
Failing catalytic converter internal structure causing rattling or restricted flow.
Related OBD-II Codes
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What You Should Do
Inspect the underside of the vehicle for loose heat shields, visible exhaust damage, or rust.
Listen for the noise with the engine running and revving.
If safe, tap the exhaust components with a rubber mallet to identify rattles.
A professional inspection may be needed to pinpoint leaks or internal converter issues.
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.
