BMW MINI Mass Air Flow Sensor 13628570107 5WK98505 Precise sensing, solves unstable idle

BMW Mini R50/R52/R53 (Cooper, Cooper S) air flow sensor (OEM 13628570107, 5WK98505) installed between the intake manifold and air filter; measures incoming air volume and transmits signal to ECU to adjust fueling and ignition timing. Installation difficulty: medium; labor about 0.5-1 hour; clean intake ducts and avoid touching sensor elements. If idle instability or acceleration stumble occurs, replace to restore optimal air-fuel ratio.