Dodge ram rear O2 sensor?

Question

Does anybody know how to bypass rear O2 sensor on a 96-2000 Dodge Ram 1500? I want to run custom exaust for racing (no catalytic converter)

Answer 1

the pcm uses the  rear o2  to "see" if the catalytic converter is working. if there is no converter, then both signals from the front and rear would be the same. by using a spark plug defouler that fits the o2 sensor  and isolates it from the exhaust a bit it fools the pcm because the amount of exhaust passing by is not the same therefore different. no light and no problem.