help i need rear o2 sensor

i got a new header and the o2 sensor was cross threaded from nissan, and i need a new o2 sensor to get rid of check engine light, and nissan is the only place i could find one and it was 165 dollars, someone posted something about an o2 simulator to get rid of check engine light, aif anyone can give me feedback of finding an o2 sensor or the simulator for aftermarket headers.

I am having the same problem passing inspection. I have to relace that rear 02 sensor and I found a cheaper part, but I can NOT find for the hell of me a Chilton or a Haynes for my model car. I have no idea how to change this thing out......hince why I have joined this site to see if someone can help me

all you need is a 7/8 inch wrench to get the o2 out. you can also get a generic o2 sensor from the local parts place