BMW e83 2.5i Intake Boot Air Mass Sensor to Throttle Housing Intake Boot Air Mass Sensor to Throttle Housing Brand NEW part with full 1 year warranty. BMW part# 13 54 3 412 291, for x3 2.5i only. Genuine BMW part, recently made: not been lying around. Fits: e83: (2004-2005): X3: 2.5i only.