I think the "sensor ring" is built into the rear cv joint itself. If the cv boot is split, it would chuck cv grease everywhere but I doubt that would affect the operation of the wheel speed sensor.

What was the original wiring fault? Can it still be the issue?

__________________
Wayne
2005 BMW X5 3.0d (b 02/05)
2001 BMW F650GS Dakar (b 06/01)