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Ignoring what the codes tell you for a minute, does the vehicle run poorly and is your fuel economy bad or gotten worse recently?
Your cat may be bad and gutting it may be fine, but it may not be your problem, be careful of jumping at shadows, look deeper to diagnose the real problem, it may actually just be a sensor problem.
Have you gone to vehicle specific discussion groups to see if yours is a common problem and how others have resolved it, everyone here has different vehicles so the info is more general and not vehicle specific.
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