Possible Reasons for a Rattling Catalytic Converter: Checklist

If you suspect a rattling catalytic converter is present, the first thing you should do is check that the cat is actually rattling. It could actually be a vibrating heat shield on the vehicle or a loose baffle in the exhaust that’s causing the problem and is being wrongly diagnosed as a rattling cat. If a rattling catalytic converter is discovered, this checklist can be used to identify some possible reasons for why this might be.

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