Exhaust Noise at Idle - Subaru Outback 2020
An unusual noise from the exhaust system at idle in a 2020 Subaru Outback may indicate an exhaust leak, a loose heat shield, or a failing exhaust component. The noise could be a ticking, hissing, or rattling sound.
Diagnosis Details
Possible Causes
Exhaust leak at manifold gasket or pipe joint
Loose or corroded heat shield vibrating against exhaust
Failing catalytic converter internal structure
Related OBD-II Codes
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What You Should Do
Inspect the exhaust system for visible cracks, loose bolts, or damaged gaskets.
Check heat shields for looseness.
Listen for the noise location with the engine idling.
If safe, feel for exhaust pulses near joints.
Consider a professional inspection if the cause is not obvious.
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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.
