Delphi AF10139 Air Flow Sensor Delphi MAF sensors are built with all-new components, not remanufactured parts Delphi's unique design eliminates the need for an additional flow tube Delphi MAF Sensors are designed and manufactured with Delphi resistors and calibrated to the OE part to be sure that every part has the exact fit, form and function By testing to OE specifications, Delphi helps to ensure that the sensors provide accurate readings and airflow output, which helps to reduce comebacks All parts are tested and calibrated to OE standards using OE equipment in US facilities