A MAF problem would affect both cylinder banks. That link clearly shows a single induction tract with one MAF sensor serving the entire engine. The fact that all the quoted codes refer to mixture errors on bank 1 only rule that out.
I still reckon lambda as it's one of the perishingly few components that affects mixture and acts on one bank only.
As I said, pull a plug on each bank. If one side is sooty and the other not, it's almost invariably a problem with the lambda sensor for that bank.
If it were me, I'd just change it. If they were particularly expensive, I might swap 'em side-for-side and then clear the errors, run it for a bit and reread the codes to see if I got a load of bank 2 errors instead, just to be sure.
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