I have a 2008 f150 2wd and my abs light came on today! What causes this and how can It be fixed?

 

The most likely cause is one of your abs sensors are bad. This happened on mine and I replaced my left front one(the bad one), and it went out. If you have a code reader, then check the code for it. Any auto parts can read this for you. Not all code readers can read abs codes. The code will point you in the specific cause of the light.