Why does the ford f150 abs light come on?

A defective wheel sensor, poor ABS module, or low brake fluid levels are the usual explanations for the Ford F-150 ABS and brake light to turn on. The brake fluid levels are the first thing You can do and try to see what might be causing the problem. You should open the hood and identify the tank of brake fluid and open it to see if it is at the recommended stage. You may need an OBD diagnostic tool now to validate what error is being encoded. If You do not have an OBD tool, since they have several available for consumers to use, You can borrow or use one from the nearest auto-parts shop. The cost of replacements will be on the subject, but based on parts and labour, it will vary from $200 to $500.