If your abs light is on, the first thing to check is the abs wheel sensors (it can be just a relay too, if you have another handy - start from there). The sensors mount inside the wheel. The dealer can do a scan for you & establish the prob. & which sensor if it's that, or you can check resistance on each sensor. They should be around 1000 ohms. If one reads infinity, it's bad. new ones are $85 or so at zygmunt.