BMW 3 E90 E91 LCI N57 Wiring Harness Engine Gearbox Module Loom Cable 7808266

BMW 3 E90 E91 LCI N57 Wiring Harness Engine Gearbox Module Loom Cable is an original wiring set designed for the precise connection of the control module, powertrain unit, and transmission. Thanks to the factory BMW design, the harness ensures stable signal transmission, proper power supply to components, and the integrity of the entire electrical system in the engine bay.

Specifications and technical data

• SKU: rhd-7808266
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7808266
• Substitutable numbers: 7808266, 12517808266, EM
• Category: Wiring Harnesses, Cables & Connectors

Purpose and function in the powertrain

The presented harness is an element from the Cables, harnesses, and connectors group, dedicated to BMW 3 Series E90/E91 LCI models with the N57 engine. It is responsible for the electrical integration between the engine, gearbox, and control module, which translates into the correct operation of the injection system, sensors, actuators, and executive components.

Thanks to the factory cable routing and matched connectors, the harness allows for maintaining the original installation architecture, minimizing the risk of assembly errors, signal interference, or communication problems between control units.

Construction, connectors, and compatibility

The harness was designed by BMW with consideration for the specific layout of components in the E90/E91 LCI engine bay. It includes a complete set of wires leading to key sensors and actuators of the N57 engine and the gearbox, as well as connectors for the control module. The placement of mounting points and the lengths of the cable sections are matched to the factory brackets and routing paths in the 3 Series body.

The original design of the harness facilitates plug-and-play installation in a vehicle equipped with the appropriate version of the power unit. In practice, this means there is no need to modify the installation, solder, or create additional cable sections, which is particularly important in modern engine control systems.

Condition, service application, and benefits of installation

The item comes from disassembly and is offered as a used engine and gearbox wiring harness. This type of part is particularly useful for repairs after mechanical damage, electrical short circuits, tampering with the harness, or when replacing the power unit with a complete assembly. Using an original harness allows for restoring correct communication between the controller and components without the need to build the installation from scratch.

Choosing an original cable from this group also offers economic benefits – installing a factory component from disassembly is usually faster and less labor-intensive than repairing a heavily damaged installation, while simultaneously allowing for compliance with BMW service documentation.

Support for the circular economy

By choosing a used engine and gearbox wiring harness, you support a repair model based on the reuse of functional components. This reduces waste and the consumption of raw materials needed to produce new parts, while also lowering service costs. If you want to learn more about the advantages of this approach, it is worth reading the article on the impact of used parts from disassembly on the environment and the driver's budget.

If you are planning a comprehensive repair or upgrade of the engine and drivetrain area in your BMW and need other elements from the same group, such as additional harnesses, signal cables, or module connectors, check the available parts in the BMW cables, harnesses, and connectors category.