The fact that you say when you disconnected the air mass meters it ran well without any faulting says a lot .
When you dis connect an air mass other sensor will go off line also because they need the reference from the air mass .
Egrs will go offline and i would say swirl flaps will go off as well , you need to check that the swirls do there sweep , you have egr codes but sometimes egr low flow codes are caused by swirls not working .
If you get a situation where one egr or one swirl is working out of phase you will get a un balance between the banks .
I think the lamda code is a consequence of another fault ....its reporting a rich situation
Under data blocks check each air mass kg / h to see if they are balanced , thinking about it if one air mass is off this will affect egr and swirls on that bank
You could try putting blanking plates over the egrs to stop gas flow , you will get egrs low flow codes as a consequence but that's not a worry for the diagnostic principle .
It could be swirls or egrs sticking in the warm up phase and then when it gets fully up to temp it frees up again , under actuators do tests on swirls and egrs to see if the sweep is smooth and voltage range hits high and low desired readings
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