BMW 325I E90 Air Flow Meter 13627520519 Air Flow Sensor Precise Match

Air flow meter directly replaces BMW original part number 13627520519; universal compatibility, suitable for E90 325i models. Its function is to accurately monitor intake air quantity and transmit signals to the ECU to adjust fuel injection and ignition, ensuring combustion efficiency. After installation, common issues like rough idle, weak acceleration, and high fuel consumption are typically resolved. If the car has starting difficulty, black smoke from the exhaust, or noticeable power loss, the mass air flow sensor is likely aging and should be replaced.