Hello all. New member here with a recently purchased 2000 jeep cherokee SE 4.0L 78k miles for around 1.2k from copart sight unseen but runs and drives.

I'm writing to you all for some help as I can't seem to find any info on the issue that I am having with this jeep after looking in the forum. So this jeep was title and registered in Massachusetts before my purchase. When I got the jeep, it started right up but had a check engine light that came up with codes p0161, p0138, p0158, p0455, p0132, p0152 and p0141. All of these seem to be related to the O2 sensors for this car. When I got under the jeep, I noticed that there are no O2 sensor and that the previous owner removed all traces of the holes for the O2. I cant find a trace of any holes where O2 can go, not before or after cat, anything. So I am writing in hope that you guys can guide me to how to fix this issue, since NY requires inspection to register the car and I cant pass it with o2 sensors missing. With no history, I was wondering if this jeep needs 4 O2 sensors, (2 pre and 2 after) or only 2? Also I cant find the plug that is long enough to get to the post cat. The o2 plug that i found is next to the transmission shifter and then in the engine bay I found 2 gray connectors and 1 black. Any help would be appreciated. Car seems to have original headers and only modified downstream. I called some local shops and they are willing to weld a o2 bung on the cat but I dont see how the o2 can reach from the shifter all the way across the car and to the cat.

Any help is much appreciated.
(Also after reading the forums, I know the '00 model has issues with cracked head manifold but I hope I dont have to deal with that yet)