Well, I did strip the temp sending unit on the rear of the block, if that counts. Had to order to stripped bolt removers online to get it out, but they have not yet arrived. once they do, it should be easy to swap the sensor in. Tried starting the jeep and also got a code, but was late for work, so I simply changed cars. I guess I left something unplugged yesterday when I was fiddling with the sending unit!