This mass air flow sensor adopts manufacturing process with stable performance and high reliability, which can provide you with superior using experience. This precise measurement allows the engine control module to determine the optimal amount of fuel to inject, resulting in improved fuel efficiency and optimized engine performance. Mass Air Flow Sensor MAF For Jaguar S-Type X-Type XF XJ XK 8 V6 V8 197400-3021 MB197400-3021 1X43-12B579-AA 1X43-12B579-AB The Air Sensor has superb technology small size light weight and compact design and can be installed without complicated steps bringing you more convenience. The air flow meter measures the amount of air entering the engine. Help the engine control unit to determine the fuel injection quantity the pressure loss is extremely small and the measurable flow range is large.