Functional description

The engine-oil pressure sensor employs a capacitive measuring procedure to monitor the absolute pressure. The absolute pressure required for a more precise oil-pressure control. Within the engine oil-pressure sensor is a ceramic plate containing gold platelets. The oil pressure from the oil passage changes the distance between the platelets to vary the capacitance. The electronic processing circuit measures the capacitance. Once evaluated, the data is transmitted to the engine control unit as an input signal for oil-pressure control.

Fig 1: Engine-Oil Pressure Sensor And Plug Connection

Courtesy of BMW OF NORTH AMERICA, INC.