ACDelco 213-4221 GM Original Equipment Mass Air Flow Sensor with Intake Air Temperature Sensor Measure the amount of air entering the engine so that the engine control module can determine the amount of fuel to inject Undergo the same stringent testing process as the original part GM-recommended replacement part for your GM vehicles original factory component Offering the quality, reliability, and durability of GM OE Manufactured to GM OE specification for fit, form, and function