Exhaust Leak or Heat Shield Rattle
A continuous noise from under the vehicle, present at all times, is often caused by an exhaust leak or a loose heat shield. The 2020 Tacoma is known for heat shield vibrations and exhaust manifold cracks.
Diagnosis Details
Possible Causes
Loose or corroded heat shield rattling against the exhaust or underbody.
Exhaust leak at manifold, gasket, or pipe joint due to thermal cycling or corrosion.
Catalytic converter internal failure or debris causing a rattling noise.
Related OBD-II Codes
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What You Should Do
Inspect under the vehicle while it is safely raised.
Tap the heat shields with a rubber mallet to check for looseness.
Listen for exhaust leaks with the engine running.
If a rattle is heard from the catalytic converter, it may need replacement.
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.
