1998 Volkswagen Passat ABS and oil light

My 1998 Volkswagen Passat has a problem with the ABS and oil lights coming on, usually when I start the car, and then it beeps three times. This continues to happen as I drive, and it will often beep three times when I hit around 80 km/h. I've taken it to so many mechanics and auto electricians, but no one has been able to figure out what the problem is. I don't want to take it to Volkswagen again, they charged me $650 and didn't fix it. I read that Passats sometimes have trouble with the ABS control module, could this be the problem?