The oil pressure in your Audi A3 is sustaining the oil flow inside the internal combustion engine and is mostly detected by the oil pressure sensor. When the sensor gets the information about the oil pressure, then the data sent to the engine control unit. Based on the calculation of the oil pressure, the engine control unit is regulating the oil flow in the engine. When the oil pressure sensor is bad, you will notice the signs given in the slides of your Audi A3.
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