Ok, I have a 96 with vortec 454 and 4 o2 sensors. 1 before each cat, and one after each cat, with two cats. Ok, the bank 2, pre-cat sensor is failing and throwing my fuel delivery on that bank way off. My question is, can I take a post cat sensor and switch it out with the problem pre-cat sensor to get my fuel delivery back on track till I can buy a new sensor? Or are the pre-cat and post-cat sensors different?