Exhaust noise during acceleration
A 2020 Subaru Outback produces an unusual noise from the exhaust system when accelerating. This is often due to a leak, loose component, or failing catalytic converter.
Diagnosis Details
Possible Causes
Exhaust leak at gasket or pipe joint (e.g., manifold, flange)
Loose or damaged heat shield vibrating against exhaust
Failing catalytic converter (internal honeycomb collapse or blockage)
Related OBD-II Codes
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What You Should Do
Inspect the exhaust system for visible leaks, rust holes, or loose heat shields.
Listen for the noise with the engine running and revving.
If a leak is found, replace the gasket or repair the pipe.
If the catalytic converter is suspected, check for diagnostic trouble codes and monitor exhaust flow.
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.
