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Since it has no other reference to determine if it is a fuel condition or a bad sensor, it takes time for it to determine that an O2 sensor is bad. OBD2 systems use secondary O2 sensors after the catalytic converters which make the process much easier to detect, but our ECUs are OBD1. If the sensor is unplugged, the ECU will find that fault right off the bat because it does perform a load test on the sensor's heater element to make sure it is plugged in, but this doesn't tell it if the sensing element is bad or not. You should replace both of your O2 sensors together so that they perform the same and it gives the ECU better information for it to develop its own closed loop/self learning table. You will also need to make sure that you reset your ECU when installing O2 sensors so as to erase the self-learning tables it has generated - in your case the revision table is telling the ECU to dump a ton of fuel and you want to be sure to reset everything so it can build new tables from a clean slate.
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