what is input turbine speed sensor a malfunction? where is it at?? on 2001 Ford Taurus

where is input turbine speed sensor a located and what is it called at the parts house because they cant find it?

Asked by for the 2001 Ford Taurus
It is nearest the steering rack side of the transmission, it is a two wire sensor connector, gray/red and dark green/white wires at the connector. It is likely the fault could be internal in the transmission if the sennsor and wiring are good.
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What is the trouble code?
po715 inpu tubine speed sensor a malfunction