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The computer has no way of knowing if the O2 sensor is bad, and it has a maximum adjustment for fuel % removed or added just in case something like this happens.
The ECU has no way to know the engine is running rich or lean. Your job during diagnosis is to unplug the O2 sensor to remove it from the equation as a possible source of problem, since the engine does not need it to run properly. You could do the same thing with the TPS the car will still run 98% normal without the TPS connected for instance.
You should probably reset your computer now, since it has learned all the wrong values from the bad O2 sensor, just give it a clean start. (unplug the battery and hit the key).
I am assuming you do NOT have a wideband or you would have caught this issue far sooner. Highly recommend you add one.
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