Bosch Mass Air Flow Sensor - 0986280216 - A mass air flow sensor (MAF) is used to measure the amount of air entering a fuel-injected engine. The Bosch 0986280216 MAF sensor is designed to be a direct-fit replacement for many vehicles on the road today. It features an aluminum housing, a plastic intake tube, and a plastic air filter. This sensor is designed to provide accurate readings to the engine's computer, allowing for optimum engine performance.