BMW 3 Series E90 E91 325i 330i N52N Engine Wiring Harness Loom 7566573 7566567

BMW 3 Series E90 E91 325i 330i N52N Engine Wiring Harness Loom is an original component from the Wires, harnesses and connectors group, designed for the precise connection of engine accessories to the vehicle's electronics. This used, factory-spec harness ensures proper signal and power routing, which translates into stable engine operation and correct communication with control modules.

Specifications and technical data

• SKU: rhd-7566573
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7566573
• Substitutable numbers: 12517566573, 7566573, 12517566567, 7566567, 12517606006, 7606006
• Category: Wiring Harnesses, Cables & Connectors

Purpose and function in the engine system

The presented harness is dedicated to the N52N engine in BMW 3 Series E90 and E91 models in 325i and 330i versions. It is responsible for connecting sensors, actuators, and engine accessories to the vehicle's main electrical system, enabling the proper operation of the control, ignition, injection, and auxiliary systems.

Thanks to its factory fitment for the specific engine and body configuration, the harness maintains the correct cable lengths, connector placement, and mounting points, which facilitates installation and reduces the risk of wire tension. This solution is particularly beneficial for professional repairs or restoring the original electrical architecture in the engine bay.

Construction, connectors and compatibility

The BMW 3 Series E90 E91 325i 330i N52N Engine Wiring Harness Loom has been designed as a complete wire structure with factory connectors, adapted to operate in the demanding thermal and mechanical environment of the engine bay. The connectors used are matched to the sensors and accessory components characteristic of the N52N unit, which minimizes the risk of installation errors.

Original manufacturing helps maintain proper circuit resistance, shielding, and connection quality, which is crucial for signal stability from sensors and the correct operation of the engine control unit. The presence of the OEM part number and related interchangeable numbers facilitates compatibility verification with a specific vehicle configuration in BMW catalogs and professional parts selection systems.

Condition, service application and benefits of installation

The item is offered as a used BMW part, which allows for an economical repair of the engine wiring while maintaining factory specifications. This is a practical solution in situations where the existing harness has suffered mechanical damage, overheating, contact corrosion, or unauthorized modifications that hinder diagnostics and stable vehicle operation.

Using an original harness from the same model series limits the need for modifications, soldering, or adapting universal wires. This reduces service time, minimizes the risk of installation errors, and maintains the clarity of the installation in the engine bay, which is important for future inspections and diagnostics.

Support with selection and additional technical information

Before purchasing, it is recommended to compare the harness markings with vehicle data and service documentation to confirm full compatibility with the specific engine and equipment version. Both the OEM part number and available interchangeable numbers are helpful here, allowing for precise component matching based on the manufacturer's catalogs.

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, sensor wires, or service connectors, check the available parts in the BMW wires, harnesses and connectors category.

When working on the engine unit and its accessories, it is also worth paying attention to the general condition of the engine and its previous operating history – you can find practical tips in the article Buying a used engine: 5 things you must check before installation, which discusses key verification stages before installing used components.