The Bosch 028021807A is a hot film mass air flow (MAF) sensor designed to precisely measure the amount of air entering the engine intake system. This sensor provides critical data to the engine control unit (ECU) for proper fuel injection and ignition timing calculations, ensuring optimal engine performance and fuel efficiency. Key Features: Hot film technology for accurate air mass measurement Direct replacement for OEM mass air flow sensor Precision-engineered to meet original equipment specifications Durable construction for reliable long-term performance Essential component for proper engine management system operation This mass air flow sensor is a critical emissions and performance component. A faulty MAF sensor can cause poor fuel economy, rough idle, hesitation during acceleration, and check engine light illumination. The Bosch 028021807A delivers OE-quality performance and reliability.