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Chevrolet Cobalt cars contain the Mass Air Flow Sensor (MAF) that aims to determine the quantity of air intake into the engine of the vehicle. The information is again transmitted to the Power Train Control Module (PCM) and then reprogram the fuel injectors to provide the right mixture of air and fuel for combustion. Mass Air Flow Sensors employed in Chevrolet Cobalt models comprise Vane Meter (VAF) and Hot Wire types. The VAF sensor, while being powerful and efficient is able to impede airflow and undergoes mechanical deterioration. On the other hand there is the Hot Wire sensor which is more accurate and flexible but damaged by contamination. Getting the MAF sensor dirty is a big no as it will cause the car to stall or always get the wrong air-fuel mixture.