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Joined: Mon Oct 23rd, 2017
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NEVER had the ABS light come on in the 5 years of driving the truck daily. I did replace the rear ABS sensor to a Raybestos one years ago. I replaced it again for an OEM Ford one only because the Raybestos connector doesn't click like the OEM one does on the sensor. I did a bunch of work to my truck months back, which included changing out the rear diff cover to a larger one.
Now when I drive I can go sometimes 100+ miles or a tank or two and then my ABS light will kick on the dash and stay on until I turn the truck off. At which point if I turn the truck on it will go through the ABS check and the light shuts off and it's fine.
If I unplug the sensor while the truck is on the light comes on instantly. Shut the truck off and then plug the sensor back in, and the truck does it's test and the light goes out. I've checked the wires and everything and there does not appear to be a short anywhere. I believe this also because if I take the sensor out of the axle housing and move the wiring all about more than what would normally happen with the suspension not ABS light comes on... but again, will come on instantly when I unplug the sensor.
Would having a larger rear diff cover cause problems like this? Note that when I pull the codes it indicates a rear sensor.
So I replaced the rear sensor again with another OEM Ford, and that seems to have helped in the sense that it doesn't happen as often but the fact that I shut the truck off and then start it back and the light is off, tells me it's not the sensor?
I am thinking about buying a new Raybestos sensor just because I never had any issues using one for 5 years and then after I switched to OEM sensor have a random ABS light come on.
I also changed out the front ABS sensor/cruise control switch on the master cylinder block along with a new harness... I hate throwing parts at things but these two items are cheap. It just gets annoying if I buy the same sensor x3...$60..etc. That's annoying to me..lol
What else could possibly cause this? I've checked with my scanner and when the rear end is up. I can see that the ABS sensor is in fact sending a speed of the rear wheels. I check the front wheels and each sensor also sends a speed/single.
This ONLY comes on when I am going slowly or stop and go type of traffic when I go from a slight crawl to almost no speed... but again doesn't happen all the time. Today it happened going to work when I was stopped and maybe going less than a mph... then I shut it off and turned the truck back on and didn't come back until coming home and stuck in stop and go crawling type of traffic....
At a loss as to what else to check/do. The fact that the light shuts off after it's check has me stumped since it's not a constant ABS on light no matter what is done...
-Nigel
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2001 XLT 2.3L
~NSG~