BMW 3 Series E90 E91 E92 330d M57N2 Diesel Manual Engine Wiring Loom Harness

BMW 3 Series E90 E91 E92 330d M57N2 Diesel Manual Engine Wiring Loom Harness is an original wiring set designed for the precise connection of all sensors, actuators, and control elements of the powertrain. Thanks to its factory-fit design for the M57N2 engine and manual transmission, it ensures stable electrical communication and proper operation of the drivetrain in BMW 3 Series models.

Specifications and technical data

• SKU: rhd-7802567
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7802567
• Substitutable numbers: 12517802567, 7802567, 12517796081, 7796081, 12517796073, 7796073
• Fuel type: Diesel
• Gearbox type: Manual
• Category: Wiring Harnesses, Cables & Connectors

Purpose and compatibility

The presented wiring harness belongs to the Wires, harnesses, and connectors group and was designed specifically for the M57N2 diesel engine in the BMW 3 Series E90, E91, and E92 generations with a manual transmission. The wiring layout is tailored to the architecture of the engine bay, the placement of the ECU, sensors, and accessories typical for this powertrain, which facilitates installation and reduces the risk of installation errors.

Construction and function of the engine wiring harness

The engine wiring harness plays a key role in power distribution and control signal transmission between the control module and the fuel injection system components, temperature, pressure, crankshaft, and camshaft sensors, as well as other auxiliary components. The connectors used are factory-matched to the sockets on the M57N2 engine, which allows for:

• a secure electrical connection without the need for installation modifications,
• maintaining the original cable routing in the engine bay,
• reducing signal interference through proper shielding and circuit separation.

As a result, the engine control system can operate under stable conditions, and fault diagnostics remain consistent with BMW's factory specifications.

Benefits of using an original BMW wiring harness

Using an original engine wiring harness in a BMW 3 Series 330d with a diesel engine and manual transmission allows for the preservation of factory control logic and engine operating parameters. The most important advantages include:

• Compatibility with the control system – the harness is prepared to work with the factory engine control unit and accessories characteristic of the M57N2.
• Proper adjustment of cable lengths and branches, which facilitates installation and minimizes stress on the connectors.
• The ability to restore proper engine operation after damage to the previous installation, e.g., as a result of overheating, corrosion, or tampering with the electrical system.
• Maintaining consistency of the installation with BMW service documentation, which facilitates subsequent diagnostics and workshop maintenance.

Condition, service application, and selection by part numbers

This item comes from the group of original BMW parts and is offered as a used engine wiring harness, which is a cost-effective solution while maintaining the factory design. It is suitable both for repairs after installation failure and for complete M57N2 engine replacements, where it is necessary to match the harness to the specific configuration of the manual transmission and diesel power supply.

For proper selection, it is recommended to verify compatibility by the OEM part number and interchangeable numbers, as well as to compare the vehicle configuration (engine type, transmission type, body generation). In case of doubt, it is worth using the vehicle's VIN or consulting the selection with a specialized service center.

Expanding the BMW engine area installation

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 additional component harnesses, sensor wires, or control module connectors, check out the available parts in the BMW wires, harnesses, and connectors category.

When working with electrical installations in premium cars such as the BMW 3 Series, a conscious approach to purchasing components is particularly important. To better plan the selection of used elements, including engine harnesses, wires, and connectors, you can use our practical guide: Safe purchase of used car parts online – a step-by-step guide.