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The ERA Mass Air Flow (MAF) Sensor, identified by part code 558166, is a critical component for modern engine management systems. It precisely quantifies the airflow into the engine's intake manifold, providing essential data to the Engine Control Unit (ECU). By accurately measuring the air density and volume, the ECU can then calculate the correct amount of fuel to inject for combustion. This precise air-fuel ratio management is vital for achieving optimal engine performance, fuel economy, and reduced emissions. This sensor is built to meet the demanding requirements of automotive applications, ensuring reliable operation and accurate readings over its lifespan. It replaces original equipment part numbers such as 55350046, 93184406, and 836646, offering a direct fit and function for compatible vehicles.