My dash is showing ABS, Traction Control and ESP/BAS . They do not work...Ideas?

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The Cruise Control does not work either. I took it to Autozone, they ran the scan and it came up as the rear left Speed Sensor. I purchased a new one and changed it out. Still, nothing. No changes. I returned to Autozone and they read the computer again.....same code. I have checked the fuses, the brakes and brake fluid is all good.......have no idea where to go from here. Any ideas would be helpful.