BMW 3 Series E90 E91 E92 325D M57N2 Diesel Manual Engine Wiring Loom Harness

BMW 3 Series E90 E91 E92 325D M57N2 Diesel Manual Engine Wiring Loom Harness is an original component designed for 3 Series models equipped with the M57N2 diesel engine and a manual transmission. Engineered by the manufacturer, it ensures proper connection of all sensors, injectors, and control elements in the engine bay. It is a practical solution for users looking to restore the full functionality of the engine's electrical system.

Specifications and technical data

• SKU: 7802567
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7802567
• Substitutable numbers: 12517802567, 7802567, 12517796073, 7796073, 12517801103, 7801103
• Fuel type: Diesel
• Gearbox type: Manual
• Category: Other Starters, Alternators, ECUs & Wiring

Purpose and compatibility

This wiring harness is dedicated to the M57N2 engine in BMW 3 Series E90, E91, and E92 generations in the 325d diesel version. The design, intended for use with a manual transmission, allows for the correct operation of all associated components, such as position sensors, clutch control, and elements responsible for communication with control modules.

Original connectors and cable routing facilitate installation at factory mounting points, which reduces the risk of installation errors and electronic diagnostic issues.

Function in the powertrain

The engine wiring harness is responsible for:

• transmitting signals between engine sensors and the ECU,
• powering actuators within the engine unit,
• stable communication of the injection system in the diesel engine,
• cooperation with systems associated with the manual transmission.

By maintaining the factory cable architecture, it is possible to maintain the correct operating parameters of the diesel engine, including stable starting, proper fuel dosing, and correct response to load.

Benefits of using an original wiring harness

Using an original engine wiring harness in a BMW 3 Series E90/E91/E92 325d M57N2 offers a number of practical benefits:

• factory-matched cable lengths and connectors for the specific engine layout,
• reduced risk of ECU errors resulting from incorrect connections,
• easier service diagnostics due to the retention of the serial electrical layout,
• consistency with the installation intended for the diesel unit and manual transmission.

This solution is particularly recommended for repairs following mechanical or thermal damage to the installation, as well as when replacing the engine with an M57N2-compatible unit.

Condition and practical application

The item comes from dismantling and is offered as a used engine wiring harness, which allows for an economical repair while maintaining the manufacturer's original specifications. It works well both for standard replacement of a damaged installation and for the reconstruction of a complete powertrain in 3 Series vehicles.

Choosing an original harness instead of adapted universal solutions reduces the risk of compatibility issues and facilitates subsequent vehicle servicing based on factory technical documentation.

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 cables, connectors, or additional electrical modules, check the available parts in the Other BMW category.

Knowledge and part selection

To better understand the design differences between sports and standard versions of power units and their accessories, it is worth reading the comparative material – the article Audi RS vs other models – what is hidden under the hood and chassis? will be helpful, as it shows how manufacturers design engine, brake, and chassis systems in different model variants.