ABS light always on and 4x4 High light blinks intermittently

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The ABS light stays on all the time now and the 4x4 Hight light blinks intermittently. Also when I've been parked for awhile the 4x4 is engaged until I start driving. Then it's disengaged. I just changed the rear differential speed sensor, front right wheel hub and sensor and brake deactivation switch. Didn't help.