BMW Mass Air Flow Sensor - Bosch 13627602038

Product Information

This OE Bosch mass air flow (MAF) sensor plays a crucial role in regulating the air/fuel ratio by precisely measuring the volume of air entering your BMW’s engine. This sensor uses a “hot wire” element—where a fine wire is electrically heated and airflow is measured by how much it cools the wire. This reading is sent to the engine control unit (DME) to adjust fuel trim and ensure optimal performance, economy, and emissions.

Over time, hot wire sensors can degrade due to contamination or electrical fatigue, leading to incorrect readings and poor engine behavior. Replacing a failing MAF sensor restores throttle response, fuel efficiency, and smooth idle.

Mass Air Flow Sensor
Accurate airflow measurement is vital for combustion control. This Bosch sensor ensures the DME receives reliable data for adjusting injector pulse and ignition timing in real-time. A failing sensor may not trigger a fault immediately but will gradually degrade performance.

Failure Symptoms:

• Check engine light: Illuminated with codes like P0100–P0104 related to airflow measurement.
• Rough idle or stalling: Due to incorrect air data affecting combustion stability.
• Fuel trim imbalance: Sensor drift may cause rich idle or lean running under load.
• Runs rich or lean: Engine compensation may result in poor mileage or hesitation.