[INDUSTRY LEADER] - As an original equipment global leader in mass air flow technology, all Bosch Mass Air Flow (MAF) sensors ensure low levels of harmful emissions with greater fuel efficiency and improved engine performance [OPTIMAL PERFORMANCE] - OE technology provides the correct function and calibration to ensure trouble-free operation and emission compliance while providing up to 20 percent better fuel consumption [READY TO INSTALL] - 100% new, not remanufactured, sensor and housing are calibrated and sold together, ensuring precise sensor reading and optimal engine performance [HIGHEST QUALITY] - Guaranteed to match vehicle requirements for performance, drivability, fuel economy and emissions Replaces OE numbers 077133471K, 077906461 For select Audi vehicles (verify specific fitment details with fit checker above): 2004-09 S4, 2002-03 S6, 2001-03 S8