Mine did that and it turned out to be the speed sensor and I never had issues with my speedometer that I noticed but turns out it was off by about 8mph for some reason and Im runing stock tires ect. After I replaced the speed sensor no more FN abs n brake lights

 

i had the same light issue after a spindle lift, no shops can figure it out with out serious money, i have cleared it numerous times and it returns, i unhooked the front wheel sensors and its been the same constant abs light always on, after the tune i get a SES light and the tuner cannot access the body control module, another shop pulled the code as a ABS mis-fire....what is that?
can the ABS be shut off?
anyone know?