If you have a new sensor, run an abs capable scanner through the obd2 port. Should tell you which corner is the culprit. Swap the sensor and check it again.
HAVE: '09 SES MTX W/ FSWerks CAI, FSW 4-1 header, Crower Stg 1, 1.5" FRPP drop, Massive Toe arms, EBC slotted rotors + green pads.
WANTS: FSW Stealth exhaust, Tune, (possibly) Turbo