Audi A4 2.0The make and model of the vehicle.Search results confirm this part is for the Audi A4 (B8 chassis, 2.0L TFSI engine).8K2907115QThe Original Equipment (OE) VAG part number for the ECU.This is the official Audi part number.MED17.1The ECU software/system type.This is a highly advanced Bosch engine control system for gasoline engines (ME/MED/MEDG17 generation).0261S04383The Bosch part number for the ECU hardware.Bosch is the manufacturer of the control unit.