Component description for the oil level check switch - GF18.40-P-4114V

ENGINE 272.963 in MODEL 171 

Fig 1: Identifying Oil Level Check Switch - Engines 272.940/941

Courtesy of MERCEDES-BENZ USA

Fig 2: Identifying Oil Level Check Switch And Connector - Engines 272.940/941

Courtesy of MERCEDES-BENZ USA

Location 

The oil level check switch is in the oil pan; the outer connector is located on the oil pan.

Task 

To recognize reaching a minimum oil level in the oil pan.

Design 

In the oil pan there is a dry-reed contact mounted in the float chamber and a float with ring magnet. A short line leads to the connector on the side on the oil pan.

Function 

When the oil level is adequate the contact to engine ground is closed. If the switch opens due to oil starvation then this is recognized by the ME-SFI [ME] control unit and a message sent over the CAN to the instrument cluster.