if anybody cares where it went
voltage reported via OBD2 proved to be a red herring, as some normally running vehicles with no codes reported have exactly same values reported
I've completely eliminated all and any things in intake side: plugges small leak in intake manifold on gaskets, cleaned injectors, swapped ignition coils between banks and jonjectors between banks - it all made car to run smoother, but P2A00 was reappearing after some time
finally, I found leaks in catalyst I've placed when dealing with P0420, it made me think I'm on right track, then removing catalyst, I found that welding on the flange to downstream catalyst leaked substantially, broke off as I was removing catalyst
no mystery anymore, replacing both catalysts on passenger side and likely this is the end of story
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