The Precat codes do not necessarilly mean that the Precats are clogged (or plugged) but you are having problems which suggest a clogged precat or main cat. Don't bother with a new O2 sensor or Berrymans for the UIM cleaning if you have a clogged precat or main cat. It won't do you any good.
I would get those items (main cat and precat) checked out ASAP and then fixed ASAP. But,....... it is your car and your money. :shrug:
I would get those items (main cat and precat) checked out ASAP and then fixed ASAP. But,....... it is your car and your money. :shrug: