Starting this weekend, first the 4x4 light comes shortly after starting to drive, followed quickly by the Brake and ABS lights coming on, followed by a beep. Googling seems to indicate one of three possibilities...steering angle sensor, wheel speed sensor(s), and transfer case actuator. The last one worries me. Do I need to go to the stearlership for a GT1 diagnosis? Snap On scan did not reveal anything useful: it threw out three codes: 24378, 50, and 00032. Will the autologic or any other scanner work?