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You might try giving the catylist can a thump with your fist or a rubber mallet.
Any rattle from within is indicative of a broken/failed/melted down monolyth which in turn can restrict flow horribly.

In regard to the oxy sensor lamp, check the FAQ at the top of this subsection for info and linx to pictures.
The short of it: all you need to do is press a button to reset.
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