abs light again, new sensor and harness

I hit a pothole a while ago and the abs inop asr came on so I thought I broke the back wheel sensor, well I got a new one, still light on , so I looked and found the speed sensor harness to the front wheel was snagged and ripped in half, got a different one and the light went off for 1/2 hour today and then its back on!!!!!!
how do I get it diagnosed and can they narrow it down to which sensor or what's causing this ?
what a pain !!!!!!




