Oil pressure switch | HELLA

General

The oil pressure switch is installed in the oil circuit of the engine. It monitors the oil pressure and turns off or on a warning light or controls an oil pressure indicator.

Function

The oil pressure switch is normally closed.

When the ignition is switched on, the oil pressure warning light illuminates. When oil pressure is built up as the engine starts, the switch contact in the oil pressure switch opens and the ground contact for the warning light is interrupted. The warning light goes out.

Possible causes of failure

Clogged inlet bore
Contact failure on connector
Internal short-circuits
Damaged measuring element
Loss of sealing

Effects of failure

Warning light is illuminated permanently or not at all
Oil pressure indicator not operational
Oil leaks

Troubleshooting

Check connectors and wiring for proper fit or damage.
Check housing for leaks.
Check engine connections and switch flange for contamination.

The following technical information and tips for practical use have been set up by HELLA in order to offer professional support to automotive workshops in their daily work. The information available here on this website is only to be used by appropriately trained specialist staff.

The reprinting, distribution, reproduction, exploitation in any form and disclosure of the contents of this document, even in part, is prohibited without our express written approval and indication of the source. The schematic illustrations, figures and descriptions are for explanation and presentation of the document text and cannot be used as a basis for installation or design. All rights reserved.