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Discussion Starter · #1 ·
I have a rattle that started in the exhaust where the O2 sensor bolts in. Sounds like a piece of metal boucing around inside the exhaust. Any idea what it may be or where it could come from? Engine continues to run fine and I'm at a loss what could be in there. Could the end of the O2 sensor fall off? Very weird.
 

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Sounds like a catalytic converter coming apart internally. Very common issue.
 
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