Wow. If you dont have any 02 sensors then your engine light will be on and you wont be able to tell if your car is running lean or rich. Why would you want to take them out in the first place? The front 02 sensors tell you if your car is running lean or rich, the rear ones deal with the cats. Now if you have an o/r mid pipe (no cats) then you get mils which turn the rear 02's off.
What about just 1 o2 sensor? The reason I ask is because I accidently didn't hook up both o2 sensors because I didn't know where both connected to. I could only find the one on the passangers side. I cannot find a place for the drivers side one to plug in. Btw, this is a 4.6l drop in. I'm not that dumb not to put the o2 sensors on.. just dumb enough to forget... and I was wondering why I was running soo lean... especially in the 2-4k rpm range. Anyone know where the driver side plug in? I'm not quite sure which year my engine wiring harness is... I think it's a 99 or 01. Either way... is there a splitter that I don't have ? Hmm.. 1 o2 sensor seems to run fine... but I Think it is because there is supposed to be a splitter... and the one o2 sensor is giving a reading for both sides. let me know...