I have been able to diagnose the specific sensor using my clone Star Diagnostic system.I ask this question before and did not get a reply. How will you know which one is defective?
If someone has access to the MB parts catalog or a receipt for past repairs it might be good to check these numbers. My Holstein parts came and look to be of good quality - the MB equivalent part numbers were marked on the bags.2 of Holstein Parts 2ABS0847 ABS Speed Sensor
Holstein Parts 2ABS0848 ABS Speed Sensor
Holstein Parts 2ABS0851 ABS Speed Sensor
This is what I ordered. Do your own double checking on these numbers to be sure.
rollerbearing; 2ABS0851 = 9065401217 2ABS0847 = 9065400317 2ABS0848 = 9065401117[/QUOTE said:What part number is for each specific wheel? When I get back home I’m going to take mine apart and clean them. But I would like to have spares and know which is which. Thx
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1) - Yep.So, is all of the following correct:
1) Both front sensors are identical (i.e., the same part number).
2) The two rear sensors have different part numbers, but the only difference is the cable length?
If so, which rear part has the longer cable? I assume that it would serve as a "universal donor".
It is the Holstein units that have lengths. Both sides are shown as 1600mm which is like 5'.1) - Yep.
2). - Yep different part numbers (MB, Bosch, and Holstein). I believe rock auto gave the lengths for the bosch units. When I hold my Holstein rears side by side they are identical except for the part numbers. So maybe they (holstein) went the universal donor route and just bags them up with the seperate part numbers anyway. I suppose they could be wound with a different sensing coil handedness - but i doubt it. No difference in connector keying either.
FYI......The tone ring is built into the bearing/seal.
The sensor will not develop a voltage when turning the wheel, it acts more like a switch and has a voltage applied from the control and passes the voltage as the wheel spins. So to measure sensor voltage while turning the wheel all the wiring would need to connected.
Wiring compromised down stream from the control unit or upstream From the sensor back ???????
View attachment 116986
Most importantly the Picoscope article says to never ohm out the sensor itself unless you absolutely know it is of the coil type. Ohming out a hall effect sensor risks damaging it.First
Doing the knowledge:-
https://www.picoauto.com/library/automotive-guided-tests/abs-speed-sensor-digital/
Next with a sensor in place, if you have a scanner with live data look at the wave form/frequency. If you are unsure of the wave form frequency check one of the good functioning channels (say the front axle) and compare.
If you have no signal on a channel go back to the harness break in front of the r/axle and check for a 5 volt volt reference signalling on one of the pins and then check the ground.
If you have an interruption /high resistance of more then 0,03 ohms , and remember these two wire harnesses collectively run along the chassis before terminating at the ABS brick/module./
Visually look for open harnesses, burning exhaust, inner fender panels having cut through the harness are all part of a successful repair. (OHM OUT THE HARNESS WITH A DVOM.)
These are the most common areas of problematic communication on Sprinters
Go for it !
Dennis
Every MB extended warranty that has been posted has been an "inclusionary" warranty that only covers listed items. None of them has listed wheel sensors or ANY part of the emissions system. Lots of people don't believe this because it seems so crazy. But it is right there in black and white, as a quick search will demonstrate.Regarding extended warranties. I read it can still be purchased while currently under warranty, which we are. Is it worth it?
Thank you for any responses regarding extended warranties.
Myolblu here. just joined. my 2016 Sprinter has also had speed sensor problems/replacements. It is frustrating. When the last one went out and my mechanic replaced it, he soldered the wires instead of using the connector. He feels the connector gets loose which makes the contacts make and break contact causing the problem. So far, that has solved the problem of the idiot lights coming on the dash etc.During a trip over to have my driver air bag recall take care of, my ABS alarm came back. They replaced the faulty sensor. The mechanic & the Sprinter service manager said what many have indicated here. They only replace the bad sensor and send you on your way. He indicated that they see the problem in dual tire Sprinters built in 2015 & 2016. I got the opportunity to talk to the mechanic privately later. He said it's a big batch of wheel speed sensors used during those years of production and MB is in denial hoping you'll be out of warrantee before the failures occur. He said the DEF system is causing them lots of problems along with biodiesel. Water emulsifies in bio and rusts up the fuel system internally. I asked about the 2019 Sprinters. He said he likes what he sees but that it's too soon to make a determination. He told me he would never buy anything new & improved that MB rolls out without it being time tested. He left them once in the 90's due to some poor reliability issues. The San Antonio Sprinter service center is one of the good ones. From what I have experienced, they do not try to rack up unneeded work & costs. They are thorough and courteous and strive to give you the very best service period.