I had this same thing happen twice. The first time I was under emissions warranty and ended up just paying for the 02 sensors. The second time I was way out of warranty and I did the 2 mini cats, main cat, 4 os sensors, hangers, associated hardware, and a cat back for about $1000 using all Rockauto parts. If you need the cats as someone said above the 2 min cats are like $400. Oh and please if you do decide to replace just the 92 sensors to diagnose the problem do not use Bosch. The Bosch do not play well with the Ecu, use NGK they are the OEM manufacturer and they are actually cheaper than Bosch.
Good Luck any Q's just ask.
"That's awesome advice. Anytime I have a difficult repair, I fix something else that's much easier to get to. This one time, there was a hole in the oil pan so I replaced the side mirror on the driver's door."
Wanted: Tuffy rear underseat drawer. PM me if you have one.