Last week I replaced both upper and lower ball joints as well as new rotors and pads on my 2001 X 4x4. I had to pull both wheel sensors to get the steering knuckles off. Both sensors were clean. Removing the wheel hubs from the rotors was a pain and may have marred a few of the teeth on the tone ring. Now my abs light is on and i'm gonna pull the codes tomorrow.How critical is this? No chips or cracks that i could tell. Also can the tone ring be replaced or new wheel hub?