Audi A4 B7 4.2 FSI V8 Petrol Engine Alternator Generator 079903018X

Audi A4 B7 4.2 FSI V8 Petrol Engine Alternator Generator is a component from the Alternators and generators group, designed for the charging system of the 4.2 FSI V8 petrol version. This solution is created to ensure stable power supply for the electrical system, reliable starting, and safe operation of all electrical consumers in your Audi.

Specifications and technical data

• SKU: 079903018X
• Mark: Audi
• Condition: Used
• OEM Part Number: 079903018X
• Substitutable numbers: 079903018X, 079 903 018 X
• Fuel type: Petrol
• Category: Alternators & Generators

Purpose and function in the electrical system

The presented alternator is dedicated to the 4.2 FSI V8 unit powered by petrol, where the electrical load is particularly high due to extensive electronics and a demanding starter motor. It is responsible for converting the engine's mechanical energy into electrical energy, powering the battery and all key vehicle systems – from engine control units and lighting to interior comfort equipment.

Thanks to its proper matching to the V8 engine characteristics, the alternator maintains stable voltage across a wide RPM range, which reduces the risk of power drops, control unit errors, and starting problems after both short and long trips.

Compatibility and part identification

The component comes from the Audi line, which ensures structural compatibility with the factory mounting system and accessory belt drive in the Audi A4 B7 4.2 FSI V8. This ensures that the correct mounting points, pulley geometry, and operating parameters matched to the stock electrical system are maintained.

The alternator has an assigned OEM part number and corresponding interchangeable numbers, which facilitates unambiguous verification of compatibility with a specific vehicle configuration. Before purchasing, it is worth comparing the markings with service documentation or the removed component to ensure correct selection.

Technical condition and advantages of using a used alternator

The offered alternator is used, which allows for an economical replacement of the component while maintaining compliance with factory specifications. In practice, this means the ability to restore the efficiency of the charging system without the need to invest in a new subassembly, while maintaining the original design and operating parameters.

Choosing a used alternator from the Alternators and generators group is particularly beneficial in the case of maintenance repairs, when the priority is quick fault removal and limiting service costs, while maintaining proper cooperation with the vehicle's electronics.

Why choose a dedicated Audi A4 B7 4.2 FSI V8 alternator

• Proper fit for the 4.2 FSI V8 engine – correct charging characteristics for a high-power petrol unit.
• Factory mounting geometry – the alternator fits the stock accessory drive system without modifications.
• Compatibility with the Audi electrical system – proper cooperation with control units and onboard systems.
• Verification possible via SKU and part numbers – easier selection for a specific equipment version.
• A reasonable compromise between repair cost and maintaining the vehicle's original specifications.

Charging system expansion and additional information

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 alternators with different parameters, generators for other engine versions, or compatible accessory components, check the available parts in the Audi Alternators and generators category.

To better plan your service and limit the car's downtime in the workshop, it is worth learning practical tips on using a wide range of used parts from a single warehouse – more information can be found in the article No more weeks of waiting – how a wide assortment in one warehouse really shortens your car's downtime at the mechanic's?.