However, the exact location can vary slightly depending on the specific engine configuration. It's best to consult a repair manual specific to your 1998 Ford Windstar 3.8L engine to get the precise location with a diagram. A Haynes or Chilton manual, or a digital equivalent, will be very helpful. You can also use online parts diagrams that allow you to specify your year, make, and model. These diagrams often show the sensor's location clearly.