BMW E90 320si N45 Petrol Engine Wiring Loom Cable Harness 7564402

The BMW E90 320si N45 Engine Wiring Harness is an original part from the Cables, Harnesses, and Connectors category, designed for the N45 gasoline engine in the 320si model. It ensures proper connection of sensors, accessories, and the engine control unit, contributing to stable powertrain operation and easier diagnostics.

Specifications and technical data

• SKU: rhd-7564402
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7564402
• Substitutable numbers: 7564402, 12517564402, 7561069, 12517561069
• Fuel type: Petrol
• Category: Wiring Harnesses, Cables & Connectors

Engine Harness Purpose and Function

This BMW 320si N45 Engine Wiring Harness is responsible for transmitting signals between the control unit and key components of the gasoline engine. It includes wires for powering subsystems, transmitting data from sensors, and controlling actuators, among others.

Thanks to the factory wiring architecture, the correct circuit topology is maintained, which reduces the risk of interference, communication errors, and engine starting problems. This is particularly important in the high-performance, sporty 320si variant, where stable operating parameters directly impact performance.

Benefits of Using an Original BMW Harness

Using an original harness from the Cables, Harnesses, and Connectors category ensures compliance with the original BMW electrical system design. This means:

• correct wire lengths and routing within the engine bay,
• dedicated connectors matched to the N45 engine's accessories,
• appropriate insulation resistance to temperature and under-hood conditions,
• retention of factory mounting points and harness routing.

This solution facilitates installation, reduces the need for modifications, and minimizes the risk of future problems with electrical contacts or wire chafing.

Item Condition and Service Application

The offered harness is a used part, which in practice means an economical repair option for vehicles where wires, connectors, or insulation sections have been damaged. Replacing the complete engine harness is often a faster and more reliable solution than spot soldering or fabricating individual wire sections.

This product is suitable for both standard repairs after a malfunction and for restoring full electrical functionality in vehicles that have been involved in collisions or had their electrical systems tampered with. Factory connectors and wiring layout help avoid compatibility issues and errors in computer diagnostics.

Compatibility and Technical Aspects

The harness is designed to work with the N45 gasoline engine in the BMW E90 320si model, ensuring compatibility with the factory control unit, sensors, and accessories. The presence of dedicated part numbers and interchangeable numbers facilitates verification of compatibility with specific vehicle configurations and production years.

Before installation, it is recommended to compare the shape, connector layout, and mounting points with the existing harness in the car. This ensures a smoother installation and reduces the risk of errors when connecting individual connectors.

Installation Expansion and Related Items

If you are upgrading or repairing the electrical system in the BMW engine bay and need other items from the cables, connectors, or harnesses category dedicated to this brand, check the available parts in the BMW Cables, Harnesses, and Connectors category.

For comprehensive service work, it is also worth ensuring the vehicle's lighting system is in good working order; a practical guide can help you choose the right components – find more information in the article See More and Better – A Complete Guide to Selecting and Replacing Used LED and Xenon Headlights.