BMW E81 E87 LCI E90 116i 316i N45N Wiring Harness Injection Valve Ignition Loom

The BMW E81 E87 LCI E90 116i 316i N45N Injector and Ignition Harness is an original engine electrical system component, belonging to the wires, harnesses, and connectors category. It ensures proper electrical connection between the injectors and the ignition system, which translates to stable operation of the N45N unit in BMW 1 and 3 Series models. A used OEM part is a sensible choice for drivers seeking a technically matched solution while maintaining attractive repair costs.

Specifications and technical data

• SKU: rhd-7570588
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7570588
• Substitutable numbers: 12517570588, 7570588, 12517570604, 7570604
• Category: Wiring Harnesses, Cables & Connectors

Purpose and Function in the Engine System

This injector and ignition harness is designed to work with the N45N engine in BMW E81, E87 LCI, and E90 models, specifically the 116i and 316i versions. It is responsible for transmitting control signals to the injectors and ignition coils, which is crucial for proper fuel delivery and spark generation.

Thanks to its factory design, the harness maintains the correct wire routing geometry, appropriate cable lengths, and matched connectors, minimizing the risk of stress, chafing, and installation errors. This is particularly important in gasoline engines, where stable electrical signals affect the unit's running smoothness and emissions.

OEM Construction and Compatibility

The offered harness belongs to the wires, harnesses, and connectors category and is an OEM BMW part, meaning it is a perfect fit for the vehicle's factory installation. The connectors used are prepared for direct connection to the injectors and ignition system components, without the need for modifications or soldering.

Key construction features:

• factory connectors that fit the N45N engine accessories,
• wires routed to minimize vibration and mechanical damage,
• system prepared for installation in original mounting points in the engine bay.

As a result, the harness can be used as a direct replacement for a damaged component, maintaining the parameters specified by the vehicle manufacturer.

Condition, Service Application, and Benefits of Installation

This part is from a dismantled vehicle and is offered as a used injector and ignition harness. This type of part is ideal for situations where the existing installation has suffered mechanical damage, overheating, or contact corrosion, causing:

• engine misfires or intermittent operation,
• engine control unit errors related to injector or ignition circuits,
• starting problems or rough idling.

Using an original harness instead of universal modifications helps maintain the integrity of the electrical system, simplifies diagnostics, and facilitates future servicing. It is a practical solution for workshops specializing in BMW and for owners who want to restore the correct operation of the fuel and ignition system without altering the factory installation architecture.

Why Choose This BMW Harness

Choosing the original injector and ignition harness for BMW E81, E87 LCI, and E90 with the N45N engine ensures compliance with factory service documentation and wiring diagrams. This simplifies diagnostic work and reduces installation time, as all wire lengths and connector placements are consistent with the manufacturer's design.

Benefits of using this component:

• guaranteed fit for specific BMW models with the N45N unit,
• reduced risk of electrical contact problems thanks to factory connectors,
• suitability for professional repairs where adherence to OEM solutions is crucial.

This is a particularly attractive solution for users who want to restore the correct operation of the injection and ignition system while controlling repair costs by using a proven used part.

Other BMW Wires, Harnesses, and Connectors and Service Knowledge

If you are looking for other BMW wires, harnesses, and connectors for your car, check out our dedicated category: BMW wires, harnesses, and connectors. You will find a wide selection of electrical system components tailored to various models of this brand.

When planning repairs on VAG group vehicles or comparing service strategies between manufacturers, it is worth familiarizing yourself with an analysis of the evolution of Volkswagen units. Practical information on common faults and cost optimization for repairs can be found in the article Volkswagen 1.9 TDI vs 1.4 TSI – Evolution of VW Engines and Repair Costs.