Mixture control, ignition timing and to aid the transmission in pressure control for accurate. Failure Symptoms: Malfunction Indicator Light illumination, failed emission test. Engine hesitation on acceleration, poor fuel economy, poor engine performance, engine nostart condition, engine surging. The item "Mass Air Flow Meter MAF Fits BMW M56 325Ci 325i 330i X3 Z4 2003-2006" is in sale since Tuesday, November 21, 2017.This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts\Air Intake & Fuel Delivery\Sensors". The seller is "globalsourcewd" and is located in El Monte, California. This item can be shipped worldwide.