Its not abs its SRS which stands for supplemental restraint system fancy wording for Airbags use a scan tool to get codes stored then diag based on the code description or take to a qualified shop for repair,most times when airbag system sees a fault and light comes on it will keep airbags from deploying until fault is fixed which means if your in an accident good luck because your airbags may not operate properly. I recommend getting fixed ASAP ,most scan tools will get the code but only trained people in these areas understand them and proper way to repair them, its worth paying the extra money for a major safety item and peace of mind