Nissan Repair: 2000 Maxima P0430 trouble code, mass air flow, o2 sensors

Question
I have this code dealing with catalyst on bank 2, reading alot online and not sure if I am looking more towards O2 Sensors or Precat on Bank 2, I do believe I had the same code when the car had around 70,000 miles, dealer reprogrammed ECM under warranty, now have 148,000, always ran midgrade gas, have had Mass air flow, all 6 plugs and coil packs, and Black O2 sensor replaced during my ownership of car, any insight would be appreciated

Answer
Brian,

I have a 2000 Maxima and have replaced all of the oxygen sensors.  Yours says bank 2 needs replaced.  But, I have found that just replacing one is just buying you time until the next goes out.  You can do this yourself as it is just a 22 millimeter wrench or an oxygen sensor socket and unplug the old one and unscrew it and install the new one and plug it in.  There are cable ties you have to deal with but they are easy.  Give it a shot and if you need help send me a note.