but my money is not on a bad sensor but the abs unit itself. but again you can get just the electronic module and change it without even breaking open a brake line.
Yeah probably so. However it's quick and easy to just check each sensor. No fancy tools or scanner required. Could quickly eliminate that and then focus on diagnosing the main unit itself.
Brain (b_dike), I wonder if local auto parts stores have ABS scanners you could borrow? I know they'll read regular ODBII codes for free. Worth a couple phone calls and checking on that tomorrow.