Replaced my front right speed sensor, bought a replacement at a local Mercedes breakers for $65.
(I knew my front right speed sensor needed to be replaced because my "ABS" light was light up on the instrument cluster every time I would start the car. Had a STAR dianosis done on the vehicle, and it said the front right speed sensor is faulty.)
It is very easy to replace the speed sensor, infact I did not even bother taking off the wheel. (Though it would be easier to do this job with the front wheel off, and car supported on PROPER heavy duty car stands)
Step 1. Get a replacement speed sensor, part number on the wire.
Step 2. Remove protection cover of wire harness on right hand side. (3 turn clips)
Step 3. Unplug speed sensor from plug in wire harness. (right circle on picture 3)
Step 4. Unclip protective cylinder near ABS module, then unplug speed sensor cylinder plug. (left circle on picture 3)
Step 5. Push the wires with the rubber "plug" down into the wheel well. (picture 4)
Step 6. Unclip wire from clip holding it to the inner wheel wall, use flat screws driver. (no pics)
Step 7. Unlcip sliding clip 1. (no pics)
Step 8. Unclip sliding clip 2. (Arrow on picture 5)
Step 9. Remove 2 bolts (Allan key) for speed sensor head. (Right circle on picture 5)
Step 10. Remove 1 bolt (10" socket) for brake wear sensor. (Left circle on picture 5)
Now that you have removed the speed sensor completely, just repeat steps in reverse when fitting the new / replacement speed sensor. Take a look at picture 7, that is what the speed sensor looked like which i removed from my car. It possibly could have been repaired by reconnecting that yellow wire, and re-insulating it. This was poorly repaired by one of the previous owners, but broke again. So it is best to replace the whole thing anyway.
If you break any clips, you can also use cable-ties to secure the wire place, dont use electrical tape.
Since I replaced my speed sensor, the "ABS" light no more comes on. But now the "Brake Replace" light replaced it lol.. I was going to change my brakes soon anyway, so Im sure that light will disapear after that is done.
Unfortunately my Cruise Control did not return
Though my front tirews are different from the back ones, so once I replace those and fit the correct size Im hoping that feature will be restored..
Hope this helps atleast some one out there..