The Bosch Mass Air Flow Sensor - 0280218439 is a precision instrument used in automotive engines to measure the amount of air entering the engine. It is a crucial component in the engine control system, as it helps to determine the correct air-fuel ratio for optimal engine performance and fuel efficiency. The sensor uses a hot wire or hot film element to measure the air flow, and then sends this information to the engine control unit. This allows the engine to adjust the fuel injection and ignition timing for optimal performance. The Bosch Mass Air Flow Sensor - 0280218439 is a high-quality, durable and reliable sensor that is designed to meet the strict standards of the automotive industry. It is compatible with a wide range of vehicle makes and models, and is an essential component for maintaining the performance and efficiency of your vehicle's engine.