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Can the cataltic converter going south cause a rattling noise. At low speed I hear a rattling noise that does not seem like it is coming from the engine or the suspension. The problem is bothering me and I wonder if is not the cat starting to come apart.
 

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the honeycomb centre can break up and rattle in the cat for sure.could be the heat shield,or one of the other boxes with a broken baffle.
 

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When the serpentine belt tensioner pulley goes, it rattles at low speeds. Stick a wooden dowel, broom handle, or a stethoscope on the tensioner bracket, and you'll know immediately whether or not that's the problem.
 
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