BMW e38 (97-01) Intake Boot Air Mass Sensor 2 Throttle housing to low meter Intake Boot Air Mass Sensor to Throttle Housing (2 Per Car) Listing is for ONE, email us for a deal if you need two. BMW part# 13 71 1 433 540, 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.