BMW Repair Questions? Ask a Mechanic for Answers ASAP
This is for the speed sensors in the transmission, you have one sensor that monitors the input shaft and one that moitors the output shaft of the transmission.
These are to detect any slippage inside the transmission, it is possible they were not hooked up properly, or they were damaged, or the transmission was not assembled correctly.
This is the torque converter side sensor location.
This is the output shaft speed sensor and location.