To be honest... suggest to replace 02sensor and add back catilitic Converter to exhaust. Jeeps are "very" dependent on all sensors working. Splicing wires together may give false reading and will tell PCM to correct false info.
I renewed old responses of past failures for jeeps for your enjoyable reading. Be aware to read all posts, as corrections first jotted down may later show to not be the answer and further parts had to be replaced.
Suggest to Keep a log of possible corrections or copy and paste (save) each blogg remembering the name of blogger.
Sometimes it is easier to see blogs from the "tree view"... look for viewing style on top right of each forum topic.
Be sure to hit/check Track this view for emails before sending messages... see bottom left!
Recently bought 97' Jeep Cherokee Sport. The catalytic converter was removed and replaced with a straight pipe. Drilled hole and mounted flanged nut for O2 sensor and found that the down stream wiring harness was cut off. Looked in my 99' Jeep Cherokee factory shop manual and found that the color of the wires are different then the 97' Jeep, can anyone tell me what the proper connections would be from the O2 sensor (one black, one gray, two whites) to the existing four wires.