Unless you have a diagnostic scan tool to find out what sensor is bad you are gonna have to take it to someone that has a scanner.But there is a few things you can do that might be able to find the problem. The first is to jack your car up one side at a time and check the wheel bearings for play alot of times if you have a bad wheel bearing this can throw your abs light. Another thing to do while you are looking at the wheel bearings is to check the abs wire that comes out of the back of your wheel bearing if has a cut in it that will throw your abs light on. If You do all this and still dont come upwith anything then you will have to take it to someone that has a scanner.

I would take it in and have it checked.

try to find someone with a obd scanner tool. it will tell you why the light is on

My light was on when i got my car together. Got ged up with trying to fix it so I just pulled the bulb out of the dash. most people want to get rid of abs antways