Oil pressure sensor

The oil pressure sensor monitors the lubricating system. The oil pressure indicator light lights up if the oil pressure does not exceed a defined value. This value is approx. 0.2 to 0.5 bar. The oil pressure sensor is connected across a signal line with the of the Digital Engine Electronics (DME). If the switch is not operated, there is a voltage of 12 Volts on this signal line; if the switch is operated, there is a voltage of 0 Volts. The data interchange is digital.

Fig 1: Identifying Engine-Oil Pressure Sensor And Three-Pin Plug Connection

Courtesy of BMW OF NORTH AMERICA, INC.

Fig 2: Oil Pressure Characteristic Curve

Courtesy of BMW OF NORTH AMERICA, INC.