Exhaust System Leak or Loose Heat Shield
A continuous noise from under the car on a 2020 Nissan Rogue is often due to an exhaust leak, a loose heat shield, or a failing catalytic converter. The sound may be a rattle, hiss, or rumble.
Diagnosis Details
Possible Causes
Loose or broken heat shield vibrating against the exhaust pipe or underbody.
Exhaust system leak at a gasket, pipe joint, or manifold crack.
Failing catalytic converter with internal damage causing a rattle or restricted flow.
Related OBD-II Codes
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What You Should Do
Inspect the underside for loose heat shields, rusted exhaust components, or visible damage.
Listen for changes in noise when revving the engine.
Have a mechanic perform a thorough exhaust system check, including a smoke test for leaks.
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.
