Engine Wiring BMW E90 E91 E92 M57N2 Diesel Loom Harness Cable Automatic 7802567

Engine Wiring BMW E90 E91 E92 M57N2 Diesel Loom Harness Cable Automatic is an original component from the Cables, harnesses and connectors group, designed for the precise connection of engine unit accessories to the vehicle's electrical system. It ensures stable signal and power transmission in vehicles equipped with the M57N2 diesel engine and an automatic transmission, which is crucial for the proper operation of controllers and sensors.

Specifications and technical data

• SKU: rhd-7802567-2
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7802567
• Substitutable numbers: 12517802567, 7802567, 12517796073, 7796073, 12517801103, 7801103
• Fuel type: Diesel
• Gearbox type: Automatic
• Category: Wiring Harnesses, Cables & Connectors

Purpose and function in the powertrain

This engine wiring harness is designed specifically for the M57N2 unit in BMW 3 Series E90, E91, and E92 models with an automatic transmission. It is responsible for connecting sensors, actuators, and engine accessories to the control modules, which enables the correct operation of the injection system, boost control, and safety systems.

Thanks to its dedicated fitment for the specific powertrain configuration, it minimizes the risk of installation errors, loose connections, and compatibility issues compared to universal solutions.

Construction, connectors, and fitment

The harness includes a complete set of wires routed in the engine bay, terminated with factory connectors adapted to work with the M57N2 unit's accessories and automatic transmission control. The layout of branches, wire lengths, and routing paths are tailored to the engine bay architecture of the 3 Series E90/E91/E92, which facilitates correct installation during assembly.

Factory connectors and wire bundling provide proper mechanical support, reduce vibrations, and protect the insulation against abrasion, which translates into stable electrical parameters over a long service life.

Benefits of using an original BMW harness

• Full compatibility with the electrical architecture of the M57N2 engine and automatic transmission.
• Proper adjustment of wire lengths and routing for the 3 Series E90/E91/E92 engine bay.
• Reduced risk of faults related to unreliable connections or incorrect wire routing.
• Possibility to restore factory powertrain operating parameters after repair or engine swap.
• Better diagnostics and controller stability due to the preservation of the original connection structure.

Application in diesel vehicles with automatic transmission

The harness is intended for BMW cars with a diesel engine where precise control of injection, boost, and engine protection systems is required. Integrating the wiring related to the automatic transmission allows for consistent management of the engine and gearbox operation, which is important for smooth gear shifting and the durability of the entire system.

Choosing such a component is particularly important during repairs following mechanical or thermal damage, or when swapping engine units, where maintaining electrical installation integrity is a prerequisite for trouble-free startup and subsequent operation.

Characteristics of the used product

The offered engine wiring harness is a used part, sourced from dismantling. Such components are frequently chosen for servicing advanced BMW engine units because they allow for maintaining original build quality while optimizing repair costs. In practice, this means the possibility of replacing a damaged installation with a factory equivalent without the need to build a new harness from scratch.

For users and workshops specializing in the BMW brand, this is a solution that combines technical fitment with a favorable price-to-functionality ratio, especially in the case of complex electrical systems in diesel engines.

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

If you are considering using components from dismantling in the powertrain and want to better understand the differences between new and used parts, selection procedures based on OEM numbers, and real cost savings, it is worth reading the guide Why it is worth buying used gearboxes and engines – facts instead of myths.