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I'm pretty confident that you are experiencing these problems because you have an exhaust leak at the donut joint where it meets the manifold.
I had the same issue and had to try twice to get it to seal properly. used a smear of sealant with new gaskets in the end.
I would throw same codes as you quote. The exhaust gas is leaking and air getting in throwing it outside of the limits of what the o2 is capable off hence the codes.
Mine is code free now. one way to tell is get someone to rev it with your hand close round the join when its not too hot, you should feel the blow if it is.
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