Need o2 sensor help (down-stream)

[offroadzj]

@whitecivic

take a set of spark plug antifoulers and drill one out with a 1/2 inch bit, put your o2 sensor in it then put the other antifouler on the end of the otherone and put back into the bung. this is the way alot of people do it if they dont run a cat and need a second o2 sensor. if you have questions pm me and ill tell you more. the idea behind it is that it pulls the sensor out of the heat more so it wont foul.

I have a cat thats not the problem. The problem is that I am not 100% sure if the rear o2 bung is still there (previous owner replaced the exhaust). IN addition, I really dont feel like jacking the car up, climbing under the car, and fighting with a seized o2 sensor. Esspecially when its only the rear o2, and the wires are easily accessible in the engine bay.