I had an abs light on my 92 integra. I looked at the ABS code, which I got from a blinking light (if i rememebr correctly) that is from inside the wall of passenger rear seat. The code told me that I have a sensor that went bad.
On each of the four wheels there is a sensor that tells the system if the wheel is spinning or not. I have one bad sensor on one wheel. The replacement part is quite expensive...several hundred dollars. I expect that if a shop had to replace this it would take loads of labor.
My solution: nothing, so I am missing abs on one wheel...oh well.