15austin

I just got a 04 gt. It already had an off road x pipe. So the check engine light was already on. I ordered mil eliminators. I got to looking under the car and noticed the rear o2 sensors are trashed. Wires broke, plugs look liked they were drug on the ground, unable to be plugged in anymore.
my question is do i need o2 sensors at all? Do i need to buy new rear sensors? Do i need to find junk sensors just ro have something to plug into?
Thanks