So my beetle has the ABS light on randomly. Sometimes when I start the car and other times on the way home. It usually is when turning curves or going into parking lot it causes pedal to vibrate which I believe is the ABS pump .I had the car scanned and it sayed problem was the left front speed sensor. So I ordered a new sensor installed it and did good until in town the ABS light kicked on and started pumping. Could the problem be with the harness/wiring for the left front speed sensor? Or do I need a new ABS module? Wouldn't the ABS module malfunction show up if scanned? Thanks for help.