I bet its a speed sensor. this would especially play into the ABS light, but also the 4x4 light if you have either the AWD system or the "advantrac" stability controll. Both systems rely on speed inputs to function. right now you have no ABS, AWD, or Traction/stability controll.
Often this happens when the wire to one of the wheel speed sensors gets snagged while driving. Infact, I remember doing a recall on some vehicles (maybe the explorer or escape) where we had to install a pigtail extension to the speed sensor wire to accomodate the suspension travel, which would rip the wire apart when going over BIG bumps or when getting some air off a jump.
Have you been hot dogging with that explorer?