Mass Air Flow Sensors (a.k.a. MAF Sensors) are precision components that measure the amount of airflow entering the intake manifold and must communicate clearly with the Engine Control Module (ECM). Remanufactured MAF sensors with debris from prior use can hinder this communication and cause the vehicle to experience drivability issues. To ensure accurate airflow, precise performance, and longer service life, APWI offer a higher-quality alternative: a line of 100% NEW, never remanufactured, Mass Air Flow Sensors