Unplug the electrical connector then unscrew the sensor.
The sensor will either screw in or have a bolt holding it. Disconnect the wiring plug then unscrew or remove the bolt to change.
Is it a 12 valve engine or 24 valve? What do you mean by speedometer sensor? Do you mean Vehicle speed sensor? If so why do you want to change that?
My auto lamp light sensor is not working on my Mercury Sable 2002. Why?
location of engine cooling fan sensor
The critical piece of information is missing from the original question: which sensor of the dozens of sensors in the typical Taurus / Sable
2005 sable fuel filter?
you do have an ( 02 ) sensor on the exhaust system
No, it's a switch that has to be replaced (common part on a lot of cars). Some cars have more than one so you must specify which sensor you need at the parts supply place.
on the dash
On the transmission.
mercury sable
Inside transmission