An ACDelco GM Original Equipment Mass Air Flow (MAF) Sensor is a key part of the engine management system, and is a GM-recommended replacement for your vehicles original component. The MAF sensor measures the amount of air entering the engine so that the engine control module can determine the amount of fuel to inject. This ensures the most efficient air/fuel mixture for the best fuel economy and power, while reducing harmful exhaust emissions. This original equipment mass air flow sensor has been manufactured to fit your GM vehicle, providing the same performance, durability, and service life you expect from General Motors.