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i almost am ready to say taht you catyltic converter is on its way out. Is sounds as if the platinum catalyst is almost decayed completly and may be rattling around as you drive and what not. Is there a loss of power or anyhting when you hear this noise? Can you tell if the noise is isolated to the engine, the tranny, the exhaust? Like where do think the noise is coming from? I knwo when my cat went i could hear like a weird rattle, then my cel came on and threw a P0420, which means my cat is ineffiecient. I dunno just a thought though, perhapos something you should check on?
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