My 4x4 light came on recently and I can't find a post where someone with just the 4x4 light on has found a solution. I have seen posts with the 4x4, ABS and DSC typically point to the transfer actuator or a speed sensor, but nothing on just the 4x4 light. Any help would be much appreciated.

2004 BMW X5 4.4i Sport - Roughly 120K