It's probably the wire for the wheel speed sensor.There was an wire with ribbed black plastic housing hanging below my car near the front right tire. I tucked it back up multiple times, but I don’t what it’s for...any ideas?
What year is your car?
Did you see the end of the wire? That is, was the cable disconnected? If so, I would expect you to have an ABS warning light, and maybe other warnings as well.