ABS light

Ok so I took my car to my mech. today (Robert Hindman aka Mod motor champ) to get the codes pulled so I can get my ABS light to go off, he said he hooked the scanner up to the car and it wouldn't do anything he said it reads fine, and he doesn't know why the light is on he also checked my ABS sensors to make sure they are good which they were, so we are both stumped and suggestions or anyone else have the same problem..