sorry bret, was not able to take pictures, but it is visible and its the only sensor behind the rotor disc with 2 align bolt around 5 mm. its shape like a cylindrical tube, and has magnetic pulse, try cleaning it before you decide any other repair for that matter. use WD 40 or any penetrating oil, it should do the job, also when the weather or temperature goes up in the atmosphere, this thing ASR tends to light up in the cluster, there is no technical explanation so far. Not even the dealer can tell you so, they will only and always play a guessing game. i have been thru it amny times.
Please give me any feed back you might have known of regarding the ASR problem, every Benz 140 with ASR will sooner or later experience this problem, its one of the cars often defect. Good Luck