Buy 2009 Audi S4 4.2L V8 A/T Cabriolet Convertible Mass Air Flow Sensor. 4.2 LITER V8, 340 hp. 4.2 - OEM Audi Part # 077133471K (077-133-471-K)

Air Meter. Mass Air Flow Sensor.
Mass Air Flow Sensor. New.

Mass Air Flow Sensor

Fits A6, A8, S4, S6, S8

4.2 LITER V8, 340 hp. 4.2 LITER, 2000-03. 4.2 LITER, A4/S4, new. 4.2 LITER, A4/S4, remanufactured. 4.2 LITER, new. 4.2 LITER, remanufactured. Cabriolet S4. S4; New. S4; Remanufactured. S8. W/O RS4, new. W/O RS4, remanufactured.
Mass Air Flow Sensor - Repair or Replace
If the mass air flow sensor or MAF meter in your 2009 Audi S4 is failing, you’ll notice in addition to the check engine light that your engine may crank and not start, or that the engine speed surges at idle.