im in the middle of trying to get my o2 sensor loose, its stuck pretty good, anyway, the wire was never really attached very well (just tied together with some tape) so i unhooked it and just for fun tried starting it up, but nothing, is it nessecery to have the o2 sensor hooked up for the car to start or am i looking at some other problems?? it was running fine before i started to work on it, so im assuming that thats the problem, but im not 100%, thanks!

 

You don't need the O2 sensor for anything except a little bit better emissions & mpg. Your car can run perfectly fine without one or with it disconnected.

 

haven't been using one (well the stocker anyway) for a year now, but my wideband o2 works great!