Thank's for the info. I figured that I would need to replace them, I just needed to hear it from someone who has been there.I have already ordered them from the parts shop, along with the pads. After reading your post, I think I may have ordered to many sensor's. The page in part's shop suggested that in most cases you need two per wheel, so I ordered eight. They are not expensive so if I have to many then I'm not out to much. Once again that for the reply.
2006 E350 98K miles
2013 Ford Explorer 15K miles