If GT1 is telling you the the sensor signal is "plausilble" . Before spending any money, hook up your GT1 and find a parking lot for a road test, w/ a second person to keep eyes on scanner...view diag request under DSC and select all ABS sensors to display. Fell free to do u-turns, eights and drive straight, but keep it under 20km ( it will not read above 20km) you will find the sensor that is failing reading 0km with the vehicle in motion.
Happened to me...Right rear sensor
Also do a continuity test from the DSC connector to check all Sensors, before replacing any parts.(remove Driver side headlight for access to DSC connector, you will have full access to this connector),
Good luck