Hello, im new here but i would like to share my point of view of the fault codes in the title.
I bought a 2002 xtype 2.5l with those codes,after researching every forum i found the only clear solution i found was that the rear bank catalytic converter is damaged/clogged.
The exhaustes cant get thru the catalytic converter and the exhaust valves cant close due to the pressure and that causes missfire.
I would suggest that if you get the same codes then remove the upper o2 sensor on that cylinder bank and try running the engine and see if it gets better.
The reason for the clogged cat i think is there has been vacum leaks/missfires sometime earlier in the cars life,and the car has been driven for a short time with the problem.
That has caused unburnt fuel into the cat,melting it.
Sorry for the long first post,i hope it helps somebody.

 

I used to sell on ebay special tool for diagnosing clogged converter, $10 or $15. Plug with tube for pressure gauge.
I still have a few somewhere.
Did you fix it? Did your codes disappear?
you probably have bad ignition coils, they killed old cat and will kill new one.

 

I have ordered a new catalytic converter, im going to change sparkplugs,coils and upper/lower intake manifold gaskets.
The old catalytic converter was totaly destroyd.
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When you install everything, check short fuel trim in case you have leaking injector.
It makes sense to clean converter, install it back and diagnose what else is bad before replacing anything. All problems have to be solved before installing new converter.
Lucky me, I live in Florida, we don't have emission control!!!