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2003 Toyota Tundra 2WD Truck - 02 and Cat issues

Hi all, I need Ideas, suggestions input. Start out with a bad AFR o2, after replaced it can’t do catalyst monitor readyness for emission check, it has been driven over 2000 miles, front catalyst converter temp in 350f, out 520f, the rear converter temp is 350 for both in and out. Anyone have any ideas? Thanks for your input.

You have a sensor or wiring problem. Re-read the temperature values which you have posted, and you will see why those readings cannot possibly be correct.