Hello everyone.
First of all sorry for my English )
I got a problem with ABS on my w221 s550 RWD
Suddenly, problems began with smooth braking at low speed - the ABS was constantly triggered, although the weather and the asphalt were dry.
After that, an ABS/ESP/Tyre pressure error started appearing. STAR DAS showed me 5100 (L6/1 left front speed sensor) and 5126 (left rear speed sensor) see image attached.
Is it really possible that two sensors failed at the same time (on one side)? Should I change both sensors? Can the rear sensor show an error due to the front one?
Thanks in advance!

 

depends on vehicle age (they are designed to die to time) and the size of the bump that made it think about life...

don't remember those specific codes for the physical wheel speed sensor

I thought 5100 is the one you get on a BMW when the ABS module's ESP pump motor brushes are playing up...

in live data you can put the wheel speeds on screen - and drive along they should pretty much all agree

 

When my left front wheel speed sensor went bad the whole dash lit up and there were errors in a half dozen modules pointing to the left front sensor, so I replaced it with a part from the dealer ($130) and erased errors and all good.