Volkswagen throttle position sensor alarm

The air flow sensor is a sensor that measures the air flow sucked into the engine. In order to obtain the best mixture concentration under various working conditions, the flow sensor of electronically controlled gasoline injection engine must correctly measure the intake air entering the engine at each moment, which is the main basis for ECU to calculate (control) the fuel injection quantity. If the air flow sensor or circuit fails, the ECU can't get the correct intake signal, so it can't control the fuel injection normally, which will cause the mixture to be too rich or too lean and make the engine run abnormally.