Hella 003259121 Engine Oil Pressure Switch

Engine Oil Pressure Switch for BMW

This Hella engine oil pressure switch is a Genuine OE from HELLA replacement for BMW applications that require a 12V, 1-pin, normally closed contact design. Part number 003259121 is built around the specified switch pressure range and thread size for direct-fit service on listed BMW models.

Key Features

• Genuine OE from HELLA product line for engine electrical service
• Engine oil pressure switch with normally closed contact function
• 12V rated, 0.25A current strength, 1 connector
• Switch pressure range: 0.2 to 0.5 bar with 10% tolerance
• M12x1.5 thread size and 24 mm spanner size
• Black housing finish matches the original part color
• Part number 003259121 for BMW oil pressure switch replacement

Detailed Description

Hella 003259121 is an engine oil pressure switch used to monitor oil pressure in BMW engines and trigger the appropriate warning or circuit response when pressure drops below the specified threshold. The normally closed contact design, 12V rating, and single-pin connector make it a direct OE-style service part for the listed BMW 325e, 325es, 325i, 325is, 528e, 535i, 535is, 635CSi, and 735i applications. This part cross-references Bosch (e.g., 0 344 101 040) for the same application.

Genuine OE from HELLA means the part follows the original equipment style and key specifications expected for factory-level replacement. The M12x1.5 thread, 24 mm hex size, and 50 Nm tightening torque specification support correct installation on the intended engine oil pressure port. If you are searching for a BMW engine oil pressure switch 12V 1-pin normally closed contact, Hella 003259121 is the catalog reference to use.

Vehicle Fitment

• Fits 1985-1988 BMW 535i, N/A — 12V - 1-Pin Connector - Normally Closed Contact; Genuine OE from HELLA
• Fits 1988 BMW 535is, N/A — 12V - 1-Pin Connector - Normally Closed Contact; Genuine OE from HELLA
• Fits 1987 BMW 325e, N/A — To 12/86; Genuine OE from HELLA
• Fits 1987 BMW 325es, N/A — To 12/86; Genuine OE from HELLA
• Fits 1987 BMW 325i, N/A — To 12/86; Genuine OE from HELLA
• Fits 1987 BMW 325is, N/A — To 12/86; Genuine OE from HELLA
• Fits 1985-1987 BMW 528e, N/A — 12V - 1-Pin Connector - Normally Closed Contact; Genuine OE from HELLA
• Fits 1985-1987 BMW 635CSi, N/A — 12V - 1-Pin Connector - Normally Closed Contact; Genuine OE from HELLA
• Fits 1985-1987 BMW 735i, N/A — 12V - 1-Pin Connector - Normally Closed Contact; Genuine OE from HELLA
• Fits 1985-1986 BMW 325e, N/A — 12V - 1-Pin Connector - Normally Closed Contact; Genuine OE from HELLA
• Fits 1986 BMW 325es, N/A — 12V - 1-Pin Connector - Normally Closed Contact; Genuine OE from HELLA

What It Helps Address

• Oil pressure warning light staying on or triggering incorrectly
• Faulty oil pressure signal from a worn switch
• Intermittent gauge or warning circuit behavior at the engine block
• Replacement needs after connector or switch wear on BMW engines
• Service for BMW oil pressure switch applications using the specified M12x1.5 thread

Installation Notes

Verify the connector style, thread size, and pressure specification before installation. Use the listed tightening torque of 50 Nm and confirm the engine is cool and the oil system is depressurized before removing the old switch. For BMW 325e, 325es, 325i, and 325is applications, confirm the vehicle build date noted in fitment before ordering.

Quality Assurance

Hella Genuine OE from HELLA parts are built to match the original equipment specification for the listed application. Part number 003259121 is identified for BMW oil pressure switch service and is cataloged with the stated electrical and mechanical parameters for accurate replacement selection.