Bought the 2002 Ford Explorer on Oct 1,14, had the 4 by 4 light comes on for no reason. Along with heavy clunking and jerking from the rear when the light is on. Been like this since day one. Almost had an accident the 2nd day at my daughter's school one morning dropping her off. Almost ran into the school building because of this problem. Could had killed myself, my kids, kids at the school. Any person standing there, the car had jumped the curb. Please, no one purchase a car from these people at J and S Auto Sales in Columbu Ohio.

I own a 2002 explorer. I am having problems with the auto 4 X 4 switching into 4 wheel drive for no reason. Most of the time it's when going from park to reverse. The 4x4 light flashes and when backing out of the drive it bucks and jerks. It does this every few minutes (flashing lights). An easy fix is to just never use reverse on your truck :) I see all kinds of problems relating to this in different explorer forums. Yes, there is a 4X4 modulator or something behind the glovebox that is the culprit in most instances.

Just to let everyone know, the dealership charges around $90.00 to put your explorer on the computer to find out whats wrong. It sounds like alot of the time it does not even show a code so you just wasted your money. Of course checking into the cost of this its gonna be around $300 dollars for the part.