1999 Ford Taurus Vehicle speed sensor

Raise the vehicle onto jack stands. If your vehicle sits very low to the ground, jack it up onto jack stands. Use the front jack point behind the radiator to raise the vehicle up. Place jacks stands underneath the front pinch welds and lower the vehicle onto the stands.

Climb under the vehicle and locate the speed sensor. The sensor is located on the bottom of the transmission, or it may be located on either side of the transmission housing. It looks like a small plug sticking out of the transmission with an electrical plug connected to its end.

Remove the electrical plug by squeezing the release tab on the top of the plug and pulling the connection apart.

Remove the sensor by turning it counterclockwise with an open-end or a crescent wrench.

Install the new speed sensor. Installation is the reverse of removal.

Sensor is located at the right end of the transmission
driver side (top by where the axle goes in )

well how to put it, its easy but not
its easy if it comes out for you as its only one bolts holding it down
but in most cases its difficult to get to and remove