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the only cats monitored are the ones directly below the manifold or the "mini" cats those are the MAIN cats the larger one is for NOX, in an OEM replacement case all the cats are replaced as a unit, mini and the larger NOX unit, here is the diag procedure for the codes you have , in 99% of the cases the cats are dead, usually caused by age or poor maintenance, they were designed to last 10 years with proper maintenence
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