The sensor for two wheel drive anti lock brakes is in the rear differential not sure which side but if you Google it will show you a picture and go from there. Also could be low fluid level in your master cylinder my 2000 had both the brake and abs light on I opened the master cylinder was low on fluid added some and both lights went out and have not come back on. Hope this helps.I have a Ranger 2001, auto two wheel drive, the ABS light is ON, can somebody helpme how I troubleshooting it, whe the ABS sensor is located? and how to reset the light?