Bosch is the actual OE manufacture, plus or minus 5% deviation from OE specification can set a check engine light
Bosch 01-09 Audi S4/S8 4.2L V8 Hot-Film Air-Mass Meter
Air mass meter, MAF sensor, HFM
Bosch Mass Airflow Sensor
Hot film air mass meter
Mass Air Flow Sensor
Audi, 2009-2001
MAF Sensor
