John,

The connectors for the front and rear sensors are right next to each other on a mounting bracket attached to the transmission, with that said, they are left and rear of the engine compartment, below the ABS module. If you can locate the connectors you will notice the top of it is Red, to disconnect, the red part of the connector slides up, a small packet screw driver will get it started, once un-plugged the piece still attached to the bracket can be forced off. There are two wire holders that hold the wire runs for both sensors snapped into the rear engine mount, if you don't know how to get them off without destroying them just use a tie wrap when re-assembling. Once the wire run is free just unscrew the old one, when putting the new one in treat it like a spark plug, don't over tighten. You don't have to pull the engine, I do everything from the bottom of the car, reaching up between the link rod, and steering, I know some who do the connector disconnect from the top and the rest from the bottom.