I know on the 4th gen, some third party front wheel bearings have been known to cause this issue (sensor pickup built into wheel bearing assembly).
Have you done any work on the car? Some mileage and other stats might help out. Is there a dashboard light sequence trick like other OBD1 cars?
Here is some info on getting the code: http://legacycentral.org/library/literature/codes.htm
Sorry, I'm pretty useless here.