it wasn't my scan tool it was a friends. i will ask him what the brand is and get back to you, but yes we brought up the 4 wheel speed sensors and were able to drive around looking at the sensors and determine one was defiantly reading a different speed then the others were.
wheel speed sensor
just went through this with my 2002. hooked it up to a good OBD2 and drove around watching my wheel speed sensors and sure enough coming to every stop my one sensor was off every time. cleaned it up and so far so good but im sure ill be replacing soon enough..