My ABS light came on the other day and now is on at all times when the car is running. From doing research on the internet, it seems like everyone suggests actually going to the dealer to get it diagnosed. Is this true? I have no issues with the braking system that I know, everything seems to work fine. I do get a little bit of a noise from I think the rear drivers side, like the rotor is warped or something (makes a rhythmic noise when applying the brake). Either way, suggestions?