Audi RS4 B8 RS5 8T Injector Wiring Loom Harness 4.2 V8 FSI Petrol 079971627R

Audi RS4 B8 RS5 8T Injector Wiring Loom Harness 4.2 V8 FSI Petrol is a specialized engine wiring component designed for 4.2 V8 FSI petrol units in the sports models RS4 B8 and RS5 8T. It is responsible for a stable electrical connection between the injectors and the control system, which translates into precise fuel metering and proper engine operation. This solution is dedicated to users who expect factory compatibility and predictable performance from their powertrain.

Specifications and technical data

• SKU: 079971627R
• Mark: Audi
• Condition: Used
• OEM Part Number: 079971627R
• Substitutable numbers: 079971627R, 079 971 627 R
• Fuel type: Petrol
• Category: Wiring Harnesses, Cables & Connectors

Purpose and function in the fuel system

The injector wiring harness in the 4.2 V8 FSI engine plays a key role in fuel injection control. It is responsible for:

• transmitting control signals to the petrol injectors,
• ensuring a stable electrical power supply to each injector,
• maintaining proper communication with the engine control unit.

As a result, the injection system can operate in a repeatable manner, which promotes proper V8 engine refinement, maintains power output, and optimizes fuel consumption in the petrol engine.

Construction and fitment for Audi RS4 B8 / RS5 8T

The presented harness belongs to the Wires, harnesses, and connectors group, designed for specific Audi engineering solutions. The layout of the connectors, wire lengths, and routing are adapted to the engine bay architecture of the RS4 B8 and RS5 8T models with the 4.2 V8 FSI unit.

Such fitment promotes:

• maintaining the original wire routing in the engine bay,
• reducing mechanical stress on the injector connectors,
• easier installation without the need for modifications to the wiring.

Consequently, the harness allows for consistent restoration of the factory electrical configuration in the fuel supply area.

Operational characteristics and advantages

In an FSI petrol engine, the quality of electrical connections has a direct impact on injection stability. Using a dedicated injector harness helps to reduce common operational issues, such as:

• misfires on individual cylinders due to an unstable signal,
• ECU errors related to injector circuits,
• performance loss resulting from incorrect fuel metering.

Selecting a component from the same design group as the original helps maintain repeatable injection system parameters, which is particularly important in high-revving V8 FSI units.

Condition, origin, and service application

The offered harness is a dismantled part and is an Audi brand component, meaning it was designed in accordance with the vehicle manufacturer's requirements. This type of used part is often chosen in professional workshops as a service solution allowing for:

• restoring proper operation of the injection system after wiring damage,
• reducing repair costs compared to purchasing a new component,
• maintaining the original electrical concept in the engine bay.

The harness will work well both for standard replacement of a damaged component and for more extensive work related to restoring the wiring in a 4.2 V8 FSI petrol engine.

Expansion of the injection system in Audi

If you are planning a comprehensive repair or upgrade of the engine area in your Audi and need other components from the same group, such as additional harnesses, signal wires, or service connectors, check out the available parts in the Audi wires, harnesses, and connectors category.

If you want to better understand the impact of component condition on vehicle handling and driving comfort, the article describing a practical approach to suspension repairs may be helpful – you can find it here: Suspension knocking? Discover a clever way to restore factory handling precision.