Exhaust Noise at Idle on 2020 Nissan Rogue
An unusual noise from the exhaust system at idle on a 2020 Nissan Rogue could indicate an exhaust leak, a loose heat shield, or a failing exhaust component. The noise is often a hissing, rattling, or tapping sound.
Diagnosis Details
Possible Causes
Exhaust manifold gasket leak or cracked manifold – allows hot gases to escape, creating a hissing or ticking noise that is most noticeable at idle.
Loose or broken exhaust heat shield – metal shield rattles against the exhaust pipe or underbody, producing a metallic rattle at idle.
Failing catalytic converter internal structure – broken honeycomb material can cause a rattling noise from inside the converter at idle.
Related OBD-II Codes
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What You Should Do
Inspect the exhaust system for visible leaks, loose shields, or damage.
Listen for the noise location with the engine idling.
Check exhaust manifold bolts for tightness.
If the noise is a rattle, tap the heat shields with a rubber mallet to identify loose ones.
If a leak is suspected, perform a smoke test or use a stethoscope.
Have a mechanic inspect the catalytic converter if internal rattle is heard.
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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.
