I second the idea with the wiring harnesses. That’s a pretty common issue on these.
When I did a job that had the car up and down on a lift a couple times (control arm moving to full extension and back a few times), the abs light was on when I was finished, even though I never touched anything abs related.
Found that all the control arm flexing broke one of the weather-worn abs wires on the front left that’s fastened to the arm and that sensor was losing signal.
See if you can go to advance or AZ and have them pull codes for you. Their scanners can almost always pull Abs codes.
If your abs light is on there should be an ABS code stored that would at least say Front Left Wheel Speed sensor circuit or something like that. Would at least save a lot of time trying to chase broken wires, or potentially even rule it out all together.
