2000 Explorer 4wd lights flashing

Posted in the Ford Explorer Forum


Hudson, WI

#1 Jan 5, 2009
I have a 2000 Ford Explorer Sport, and the 4wd and 4wd low lights flash about six times, the ABS light is on, as well as the chech engine light. I just got back from a local shop I trust that could scan all of the codes in my explorer. It came up with a c1230 & c1102 for the ABS, which sounds like the speed sensor on top of the rear differential. The check engine light is because of po171 (system too lean bank 1) and po174 (system too lean bank 2). And they told me the "shop computer" could not communicate with the 4x4 module. Has anyone heard of this? They told me it 'might' be a bad 4x4 module, which was around $400, but my 4x4 and 4x4 low range work fine, but the lights on the dash (4wd & 4wd low) flash, and do not indicate the mode the 4wd is in. Again, the 4wd functions fine. Any suggestions? Thanks in advance!

Chillicothe, OH

#2 Feb 4, 2009
My 99 is doing the same thing. I just had a new transfer case put in and that's when the lights flashed, same # of times. When I start my vehicle, it's stuck in 4WD. So far, no luck in figuring this out either!

Hudson, WI

#3 Feb 14, 2009
Hey! I replaced the ABS speed sensor on the top of the rear differential. It was $25 at the ford dealer. Replacing that took care of the ABS light and 4x4 lights flashing! I also said the Check Engine light was on, that was fixed by replacing the o-rings (upper and lower) on the intake. It was not too hard of a job either. Now my Explorer has no lights on the dash flashing or on at all! I am not sure about the "stuck 4x4" though. I would try the sensor on the rear diff since it is so cheap right from the ford dealer. If your dealer charges more than $30, I would get it from a parts store for about $25. O’reilly or Advanced auto parts. Good luck! Tim

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