An ABS sensor is just a few hundred feet of hair thickness wire with the middle 197 feet wrapped round a plastic bobbin to make a coil. The thin wire makes them sensitive. Try solder rather than the crimps. If you change the resistance from the 10-20 Ohm sort of area the ECU will see it and take its bat and ball home.
When you get home swap the front and rear sensors at the ECU plug. If the fault moves (new code) its the sensor. If it stays put it's the ECU. Usual fault on vehicles with more than three wheels is from where the pin goes into the ECU onto the circuit board. It has been known for careful use of a Stanley knife and soldering iron to avoid having to sell a Kidney or first born child.
Ted, you've just cost BMW thousands.  All those "ECU resets" where clearing the error memory has swept the faults under the electronic carpet at £60 a pop
Andy
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