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nekky,
I am sorry if this comes off a bit brusk, but if you would have performed a basic Google search on 'BMW P2629', you would have been rewarded with
P2629 O2 Sensor Pumping Current Trim Circuit/Open Bank 2 Sensor 1
This is the pre-cat sensor (B2S1) on cylinders 4-6.
Personally, I would only replaced the failed sensor.
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