Hey, I'm new to this forum. My mom's 2007 E-350 (12 pass.) is showing a message in the instrument cluster about the RSC needing something (don't know what exactly it says, haven't seen it myself, just been told by mom and step-dad...). We've heard something about a speed sensor in the wheel/hub area. Anyone know anything about this?

 

RSC utilizes the ABS (anti lock brake )system in order to function as designed. And the ABS system utilizes wheel speed sensors to do its job.