Mass Air Flow (MAF) Sensor — direct-fit replacement for BMW 3 Series (E83, E87, E90, E91, E92, E93) Key benefits Restores accurate air intake measurement so the engine control unit receives correct airflow data. Helps resolve common symptoms of a failing MAF sensor: rough idle, reduced fuel economy, hesitation under load, and unexpected engine light alerts. Direct-fit compatibility with the listed BMW models and part numbers ensures a reliable replacement without guesswork. What this part does Functions as a mass air flow meter sensor to measure the volume of air entering the engine. Accurate airflow data is essential for correct fuel metering, smooth idle, and consistent engine performance. Provides reliable performance to help maintain optimal engine operation when installed as a replacement for a worn or faulty MAF sensor. Compatibility and part numbers Compatible BMW chassis: E83, E87, E90, E91, E92, E93. Suitable models include: 318i, 320i, 118i, 120i, X3, Z4. Correct fit confirmed by part numbers: 13627531702 and 13627566989. Before purchasing, compare these part numbers with your vehicle’s existing MAF sensor or VIN-specific parts list to confirm compatibility. Performance and fit Accurate airflow measurement supports proper fuel-air mixture and engine control responses. Intended as a replacement for factory units specified by the listed part numbers; designed to match the original fit and function for the applicable BMW models. Reliability focused on restoring engine smoothness and drivability. Practical use scenarios Replace a failing MAF sensor on a 320i (E90) showing poor fuel economy and throttle hesitation to restore normal performance. Swap in this sensor on a 118i or 120i that has an intermittent rough idle and a persistent check engine light to eliminate MAF-related faults. Install during maintenance or after intake-system work on an X3 or Z4 to ensure accurate air measurement and optimal engine tuning. Installation note This sensor is intended as a direct replacement for the factory part numbers listed. Verify connector type and part number match before installation. If in doubt, confirm compatibility with your VIN or consult a technician. Use this MAF sensor to restore correct airflow readings and help maintain the intended performance of your BMW engine.