BMW e39 528 (97-98 +ASC) Intake Boot Air Mass Sensor to Throttle Body e39 Intake Boot Air Mass Sensor to Throttle Body NOTE: Only for cars with ASC+T BMW part# 13 54 1 740 931, note the mid-year splits. Genuine BMW part, recently made: not been lying around. Please NOTE the mid-year split on PRODUCTION date. Not sure about your car? email us your VIN to confirm.