if you put it on a code reader it sould show what the fault is and which wheel. you can disconnect each cable at the wiring jiont on the body end if you check them all with an ohm tester the one that reads a different reading is usally the one thats wrong if its speed sencer.sometimes the ring comes lose on the drive shaft so this also causes the fault.
bob
December 2011
Probably a sensor on one of your wheel hubs. Had any wheels off lately?
By the way, it would help if we knew what vehicle. some vehicles have common faults.
ChicksFan
December 2011
Automatic Answer
We may have found other answers which could help you.