Pulled the Grand Cherokee into the garage for some long overdue tasks. I finally changed the rear O2 sensor out that has been seized into the port for the last 6 months. There is a lot of truth to the statement that the worse a penetrating oil smells, the better it works. Aerokroil has to be the smelliest crap that I have ever had the displeasure of using, but it does work.
As a bonus, the last person to change the sensor cut the pigtail off and directly wired the sensor in. I was going to replace the pigtail and do it properly, but that plug costs $36 and will likely never be unplugged again.
I also bought a new battery and new negative clamp so it will quit turning my battery clamps into white fuzz.
More money down the Jeep hole...