On any OBD II vehicle, the designations are the same: cylinder closest to the crank pulley is cylinder #1. Chrysler, Ford, Toyota, whoever. The bank with that cylinder in it is bank 1. Sensor 1 is the "upstream" sensor, closest to the head, before the cat. Sensor 2 is downstream of the cat. If there is just one sensor 2 due to the exhaust joining before the cat, it is called B1S2.
Just curious: Is there any chance that the cat is bad/missing/hollow? The PCM compares the up- and downstream oxygen sensor switching rates to determine if your cat is dying (meowww...thump) and a bad sensor, or a sudden change in the sensor's performance, will give the computer fits in this regard. For this reason, you should clear the PCM's memory using the parts store's scan tool, and don't be surprised if it tells you you have a "catalyst efficiency failure" two weeks after you replace the sensor.