2008 Audi A4 Quattro Mass Air Flow Sensor - AutoZone Equip cars, trucks & SUVs with 2008 Audi A4 Quattro Mass Air Flow Sensor from AutoZone. Get Yours Today! We have the best products at the right price. Audi A4 Mass Air Flow Sensor - AutoZone Compact, sleek and powerful, your Audi A4 is the kind of executive sedan that continues to turn heads. What isn't attractive is a struggling A4 that needs its air flow sensor replaced.