Hello and thanks for using Just Answer, you will need to have the ABS "scanned" for trouble codes. Just like the check engine light sets codes, so does the ABS light, as well as the airbag light. A real diagnostic scan tool will be needed, not just an inexpensive code reader. Some of these parts stores that advertise "free check engine light scan" may be able to help if they're using a real scan tool. Otherwise, you'll probably need to seek the assistance of a repair facility. As long as brakes seem o.k., probably nothing to be terribly concerned with, most common faults are speed sensors. The only downside is you will not have ABS braking when light is on, so if you hit pedal hard enough, wheels can lock up like an older car. Good luck, hope this helps, if it does PLEASE hit ACCEPT.