This HELLA Mass Air Flow (MAF) Sensor, part number 8ET 009 149-311, is designed to accurately measure the amount of air entering the 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 sensor can lead to various drivability issues, including rough idling, hesitation, poor acceleration, and illuminated check engine lights. HELLA is a trusted name in automotive components, known for its commitment to quality and reliability. This sensor is manufactured to meet stringent industry standards, ensuring a direct fit and dependable operation for your vehicle.