1993 Ford Taurus follow up

The car is a 3.0L, SHO, DOHC. Occasionally the brakes will grab during operation. It feels similar to an air bubble in the line but the brake system has been flushedand bled numerous times without positive results. The codes were taken by a local les schwab tech using a digital meter. Some of the codes are repetive which makes little sense to me. How do I know if I have bad sensors or an actuall problem? Am I looking at changing the sensors as well as the hego sensors? I have been told by 3 techs that the brakes are fine, even wear on the pads and rotors