Rear sensors are purely for determing cat efficiency and will not throw any other codes.

Your code is for a pre-cat (front) sensor anyway. If you aren't getting a fault for the rear, then they are fine.

Have you tried swapping the front 02 sensors around to see if the fault follows the sensor? Could be a new defective sensor. Or try putting the original sensor back in place of the bank 2 front sensor that is throwing the fault.

Did you reset the adaptations after doing all that work? If it was running WAY lean before because of the vacuum leaks it could run rich after the repairs. But if you have driven 2k since then, that isn't likely.

So, its not a bad fuel injector or coil, if changing out the bank 2 pre-cat O2 sensor doesn't fix it, then try swapping around the spark plugs. While doing that, look carefully at all the plugs and note any that look different than the others. A black or wet plug is the culprit.

Clean the MAF yet?

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Olympic Peninsula, WA, USA
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2005 Mini Cooper 100k, British Racing Green/Silver-Black
04/2002 4.6is 140k, Silver/Black-Alcantara *FOR SALE*
1989 325iX 270k, Diamond Black/Black
1984 318i 370k *SOLD* (First Bimmer)
Honorable Mentions: '71 2002, '87 325, '90 325ic, '92 525it, '93 325i, '94 530i