Engine Wiring BMW F30 F31 335dX N57Z Automatic Gearbox Cable Harness 8574024

BMW F30 F31 335dX N57Z Engine Wiring Harness is a factory part from the Cables, Harnesses, and Connectors category, designed for advanced BMW diesel engines with xDrive and automatic transmission. The original design ensures the integrity of the entire engine harness, stable communication between components, and safe operation of control systems.

Specifications and technical data

• SKU: 8574024
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8574024
• Substitutable numbers: 8574024, 12518574024
• Fuel type: Diesel
• Gearbox type: Automatic
• Category: Wiring Harnesses, Cables & Connectors

Intended Use and Function in the Drivetrain

The presented wiring harness is a part of the engine harness intended for BMW 3 Series F30/F31 models in the 335dX version with the N57Z engine, powered by diesel and paired with an automatic transmission. It is responsible for connecting sensors, actuators, and control units in the engine bay, enabling the proper functioning of the injection system, turbocharging, and protection systems.

Thanks to its factory-specific fit for the particular drivetrain configuration, the harness maintains the correct wire routing, appropriate segment lengths, and compatible connectors, which reduces the risk of mechanical stress and installation errors.

Construction, Connectors, and Compatibility

The harness belongs to the Cables, Harnesses, and Connectors group, meaning it includes a set of electrical wires with factory connectors, protective sleeves, and mounting points. The construction is designed for operation in the demanding environment of the engine bay, considering elevated temperatures, vibrations, and contact with operating fluids.

Key technical features of this engine harness:

• dedicated fit for the N57Z diesel engine in the 335dX version,
• designed for cooperation with an automatic transmission,
• original routing geometry of wires in the engine bay,
• factory connectors compatible with BMW sensors and control units.

This configuration facilitates a plug-in installation to replace a damaged or worn-out harness, without the need for modifications to the existing system.

Service Application and Benefits of Replacement

Engine harness replacement is recommended in case of mechanical damage to wires, corrosion of contacts, insulation abrasion, or communication problems between the control unit and sensors. Using an original harness dedicated to a specific 335dX variant allows for:

• restoring stable operation of the injection and turbocharging systems,
• minimizing the risk of electrical errors and intermittent faults,
• maintaining compliance with the original BMW harness architecture,
• reducing diagnostic and installation time compared to universal solutions.

For vehicles with all-wheel drive and automatic transmission, maintaining correct communication between the engine control unit and other modules is particularly important, which this harness ensures.

Product Characteristics and Condition

This item comes from the BMW offering and is marked as a used product, which means it has been previously operated in a vehicle but retains the functionality required for further operation in the drivetrain. For many users, this represents a favorable compromise between cost and maintaining the original manufacturer's specifications.

Thanks to its factory origin, the harness is consistent with BMW service documentation, which facilitates the identification of individual branches, connectors, and mounting points during installation and subsequent service work.

Selection Support and Additional Materials

When selecting an engine harness for a specific BMW 3 Series version, it is advisable to verify compatibility with the fuel type and transmission type to avoid installation issues and ensure full system functionality. If necessary, electrical diagrams and service documentation can be helpful, allowing for quick location of individual connectors and circuits.

If you need other parts from the category of cables and electrical harnesses dedicated to this brand, check the available parts in the BMW Cables, Harnesses, and Connectors category.

For those planning a more extensive vehicle upgrade, including improving cabin comfort and ergonomics, valuable tips for selecting used parts can be found in the article Premium Interior for Half the Price: Used Seats, Steering Wheels, and Multimedia.