After ordering the proper part with the help of the phone customer service tech, I moved the stove from the wall, unclipped the connector, removed the two screws holding the sensor in place, and removed it. Reversed the above to put it back, and the oven holds perfect temperature.
Removed sensor from back wall of oven by removing 2 screws from flange. I could not pull the wire-nut connections out through the small hole and thought I would have to pull the whole oven out of the wall to acess the connections from the back so instead I clipped the wires close to the old sensor and connected the new sensor with the small wire nuts provided, then enlarged the hole in the oven wall, being careful not to pinch the wires then pushed the wire nuts and extra wire back through the hole and put the screws back in the flange.