BMW F90 M5 F92 M8 Oil Level Sensor Wiring Harness Loom Cable 7855481

The BMW F90 M5 Oil Level Sensor Harness is an original electrical system component designed for precise connection of the oil level sensor to the engine control unit. Thanks to BMW's factory design, the harness ensures a stable measurement signal, supporting the proper functioning of the lubrication system and the safety of the powertrain. This solution is particularly useful for repairs after mechanical damage, collisions, or interventions in the electrical system.

Specifications and technical data

• SKU: 7855481
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7855481
• Substitutable numbers: 7855481, 12517855481, 7857053, 7370161, KD
• Category: Wiring Harnesses, Cables & Connectors

Purpose and Function in the Lubrication System

The oil level sensor harness in the BMW F90 M5 is responsible for a reliable and interference-resistant connection between the sensor and the engine control unit. A properly functioning circuit allows the control unit to continuously monitor the oil level, which is crucial for:

• monitoring oil level and displaying warning messages on the instrument cluster,
• protecting the engine from operating with too low a lubricant level,
• maintaining proper powertrain operating parameters under road and track conditions.

By using a dedicated harness, you avoid makeshift repairs that can lead to errors in oil level readings or intermittent signal interruptions.

Construction, Connectors, and Compatibility

This item belongs to the Cables, Harnesses, and Connectors group, meaning it is designed as an integral part of the BMW electrical system. Characteristic features of this harness include:

• factory connectors matched to the oil level sensor and the vehicle's wiring,
• appropriately selected wire length, facilitating routing in the original path,
• insulation adapted for operation in the engine bay, near heat sources and vibrations.

Original connectors minimize the risk of contact looseness, contact oxidation, and accidental disconnection during the operation of a high-performance vehicle like the BMW F90 M5.

Benefits of Using an Original BMW Harness

Using the original oil level sensor harness in the BMW F90 M5 offers tangible service and operational benefits:

• Plug & play – no need for wiring modifications, soldering, or using universal connectors,
• maintaining factory resistance to vibrations and thermal conditions in the engine bay,
• reduced risk of engine control unit errors related to incorrect oil level readings,
• easier diagnostics – an original harness eliminates one of the potential sources of electrical problems.

For workshops specializing in the BMW brand and owners who care about the technical condition of their car, using such a component is a practical way to maintain the integrity of the entire system.

Characteristics of a Used Component

The offered harness comes from the BMW parts group and is a used component, which in practice means the possibility of an economical repair while maintaining original quality of workmanship. For harnesses and connectors, using a disassembled component is often more advantageous than installing aftermarket alternatives with uncertain electrical and mechanical parameters. Before installation, a standard check of the insulation condition, connectors, and potential contact cleaning according to good service practice is recommended.

Expanding Work on the BMW Electrical System

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other components from the same group, such as additional harnesses, wire sections, or service connectors, check the available parts in the BMW Cables, Harnesses, and Connectors category.

If you are interested in a broader context of system operation in modern cars and want to better understand the dependencies between the electrical system and mechanical components, it is worth checking out the article on exhaust systems and performance components: Performance Exhaust System: Used Headers and Sport Catalytic Converters on the Road.