To be absolutely certain, you should:
* Consult a repair manual specific to your 1997 Ford Taurus wagon's engine. This will have diagrams and precise locations.
* Use a reliable online parts diagram. Many auto parts websites (like AutoZone, Advance Auto Parts, etc.) allow you to enter your vehicle's information and view a diagram showing the sensor's location.
Don't rely solely on general descriptions; visual confirmation is best to avoid misidentification.