Stumped on 02 sensor ???

[DanXJ97]

Hi folks, Dan here again with a new problem. I have a 1997 Jeep Cherokee, 4.0 engine, auto trans. Check engine light came on today and my code scanner gave me P0132 which means problem with O2 senor. Went NAPA and bought both sensors and replaced them, I used a little dielectric grease on the connecters when I put them in. I checked the 15amp fuse in the main power box under the hood. It checked fine and I don't know if there is a second fuse or not. I still have a check engine light (code P0132)and my scanner won't clear it, I have checked the wiring as much as I could and have not found anything wrong. Someone might check my part numbers because the new rear sensor is smaller in size than old the one. I have not probed any wires for power yet.
NAPA part numbers:
Front NGK 23151
Rear NGK 23099
Any ideas would be great and thanks for the help.