Lateral Acceleration Sensor. The part is the Lateral Acceleration Sensor that's mounted under the center console of the vehicle. The part number on the label is:A163 542 0618.
This product solved a BAS warning light that had been on for years. I believe it fixed my antilock brake issue while turning on a decline where left front brake was intermittently engaging. I thought it didn't work initially, but after turning car off and then using my car the other day the computer cleared the code.