There is absolutely no need to replace an O2 Sensor as a preventive maintenance item. If it starts setting a code and turning on the check engine light, then it is time to replace it. Otherwise there is absolutely no gain to be had by replacement.

I have one car with 186,000 miles with original sensors, another with 278,000 miles with original sensor. They both run great and get the same mileage they always have.

If it ain't broke don't fix it. You stand a bigger chance of causing problems by changing it, especially since you will be rewiring the Ford sensor. Put the new sensor in your toolbox and save it for the time when you might need it.

Good luck,