Hello, you are correct that there is standing TSB pertaining to a wheel speed sensor. A bad one will turn on all lights and set a trouble code. Without code, I can not say what sensor may be bad. the front sensors are part of the wheeel bearing hub. Most any shop can hook up scanner draw code and tell what sensor may be bad. You may be under warranty for this if you are not over the mileage. It was NOT a recall as you know. Most likely bad speed sensor. Which one? only a scanner hooked up can tell. Most parts stores will do a free scan if you would like that info or to at least know waht code and what sensor is at fault.