Exhaust Leak or Heat Shield Rattle
A continuous unusual noise from under the car on a 2020 Ford Mustang is often caused by an exhaust leak, a loose heat shield, or a failing exhaust component. The noise may be a rattle, hiss, or metallic sound.
Diagnosis Details
Possible Causes
Loose or corroded exhaust heat shield rattling against the underbody or exhaust pipe.
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 metallic noise.
Related OBD-II Codes
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What You Should Do
Inspect the underside of the vehicle for loose heat shields, exhaust leaks, or damaged components.
Tighten or replace any loose shields.
If a leak is found, repair or replace the affected exhaust part.
For catalytic converter issues, further diagnosis with a scan tool is recommended.
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.
