Hey guys i m starting my car today , getting ready to go to school and my ABS light turns on, and stays on, What can the problem be? Maybe a sensor?

I have a 2002 SE...

 

most likely a sensor... i had mine do that and had to get the rear sensor replaced. you're lucky the light didn't come on when you were driving cause mine did and I had no brakes for about a sec and almost crashed. this happened to me right after I got my pads replaced so I went back to the dealer and was like