Service emissions system

The history codes are something that has occurred, or set in respect to a current fault. The current codes are something that is actively occurring, or has occurred in that ignition cycle. I would clear them and see which ones reset. As far as O2 i.d., bank one is the bank of cylinders with #1 cylinder inclusive. On your engine, that is the rear bank. So bank one sensor one is in the rear bank manifold, bank 2 sensor 1 in the front manifold. If there is four sensors, there is a bank one sensor 2 pre-cat, and a bank one sensor 3 post cat. On later models there is the two in the manifold, and the post cat sensor for a total of three. Reply back with the codes, I am assuming a p013?. On 96 there was a calibration upgrade to the PCM for slow response faults. There is also a possibility of a contaminated sensor, and may indicate an internal coolant leak.

Here is a guide that will show you how to change the sensor out.

https://www.2carpros.com/articles/how-to-replace-an-oxygen-sensor

Please let us know if you need anything else to get the problem fixed.

Cheers