Exhaust System Leak or Heat Shield Rattle
A continuous noise from under the car on a 2020 Honda CR-V is often due to an exhaust leak, a loose heat shield, or a damaged 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
Damaged or failing catalytic converter or muffler internal structure
Related OBD-II Codes
Not satisfied with this diagnosis?
Try Another DiagnosisWhat To Do Next
What You Should Do
Inspect the underside of the vehicle for loose heat shields, visible exhaust damage, or rust.
Check for exhaust leaks by feeling for puffs of air or listening for changes in sound.
Tighten or replace loose shields, and repair any exhaust leaks.
If the noise persists, have a professional inspect the catalytic converter and muffler.
Related Repairs
Share this diagnosis
Help others with similar symptoms
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.
