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Redeye, my tech and I were fiddling with this same issue on my car a while back and he made two important statements to me that are worth passing along:
1. The computer throws codes that are not completely indicative of a correct failing part. I got a fouled MAF reading that was actually a burned tip on one of my 02 sensors. Replacing the oxygen sensors cleared the MAF errors. Go figure.
2. Replacing one 02 sensor will give very sensitive readings and the others, aged with heat and probably carbon, will provide dull readings and the computer will hunt for another reason to throw a code. This is why all four are replaced. [As I read your posts I see you're no stranger to a motor and it's components, so I'm just sharing what he taught me. I'm sure you already knew this.]
I replaced all four of mine when this same issue cropped up and it was worth the $450 I paid for all new sensors. Within about a half hour of driving the performance increase was noticeable and my fuel economy improved.
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