This HELLA Mass Air Flow (MAF) Sensor, part number 8ET 009 149-471, is engineered to accurately measure the amount of air entering your engine's intake manifold. By providing this critical data to the engine control unit (ECU), it allows for precise adjustments to fuel injection and ignition timing. Proper functioning of the MAF sensor is essential for maintaining optimal engine performance, improving fuel economy, and reducing emissions. A faulty MAF sensor can lead to various drivability issues, including rough idling, hesitation, poor acceleration, and increased fuel consumption. HELLA is a trusted brand known for its high-quality automotive components. This sensor is designed to meet or exceed original equipment specifications, ensuring reliable and long-lasting performance for your vehicle.