2001 regal gs with abs and traction control lights on. Scaner reads 8 codes: C1216, c1222, c1226, c1232, c1233, c1234, c1235 and c1245. Removed and checked voltage and resistance on all 4 speed sensors - all appear fine. Any ideas?

Without looking those up. That looks like every wheel. I think the 1233, 34, 35 etc are the various wheels.

Have you checked the fuses etc to ensure it'* not the system throwing every code because it'* not getting power etc? Make sure the connectors at the ABS unit are clean and mating well?