Volvo 850 O2 sensor troubles

[Krisemann]

Update: I drove the car to the garage today, and it still has some issues, but it's as if they're getting better. I've read that the ECU sometimes gets used to new sensors, so I was wondering if this is the case for me as well? I can no longer replicate the low idle issue, and while I'm still suffering from power loss when the throttle isn't at max, it is much better than yesterday. I'll drive it around some more and see if it fixes itself