Audi A4 B9 A5 F5 Q5 FY A6 C8 A7 C8 Alternator Generator Valeo 04L903018A

Visual condition of the part

The product shows signs of use visible in the photos.

Audi A4 B9 A5 F5 Q5 FY A6 C8 A7 C8 Alternator Generator Valeo is an original component from the Alternators and generators group, designed for modern Audi diesel engines. It ensures a stable power supply for the electrical system and proper battery charging in Diesel engine vehicles, which is crucial for the reliable operation of all onboard systems.

Specifications and technical data

• SKU: 04L903018-1
• Mark: Audi
• Condition: Used
• OEM Part Number: 04L903018
• Substitutable numbers: 04L903018, 04L 903 018, 2627316G
• Fuel type: Diesel
• Part type: Alternator
• Category: Alternators & Generators

Purpose and compatibility

The presented alternator is designed for use in popular mid-size and executive Audi models, such as the A4 B9 generation, A5 F5, Q5 FY, A6 C8, and A7 C8 with diesel engines. The design, based on Valeo solutions, allows for effective interaction with the vehicle's extensive electronics, typical of modern Audi platforms.

Thanks to the use of the original charging system architecture, the alternator works seamlessly with the factory engine control unit, comfort systems, and advanced power consumers (e.g., extensive lighting, multimedia systems, driver assistance systems). This solution is dedicated to Diesel units, where electrical loads and voltage stability requirements are particularly significant.

Construction and performance parameters

The Valeo alternator used in these Audi models utilizes a proven design integrated with a voltage regulator and rectifier system, which translates into uniform battery charging across a wide range of engine speeds. The applied technical solutions limit voltage drops under high system loads, which is especially important in cars equipped with numerous safety and comfort systems.

In practice, this means:

• stable supply voltage for engine control units and safety systems,
• reliable battery charging during city and highway driving,
• adequate power reserve for additional electrical consumers.

By being matched to the specific Audi platform, the alternator maintains the correct mounting geometry and operating characteristics, which facilitates installation and subsequent operation.

Application in Diesel engines

Audi diesel units require an efficient charging system due to the presence of advanced injection systems, glow plugs, complex control units, and often additional energy consumers. The alternator from this offer has been prepared specifically for the requirements of Diesel engines, ensuring appropriate current efficiency and operational stability under varying load conditions.

Such matching is particularly important in vehicles used intensively – in city traffic, on long routes, or in conditions of increased energy demand (night driving, low temperatures, frequent use of heating, audio systems, and multimedia).

Condition, origin, and benefits of choosing a used part

The offered alternator comes from the original Audi production line and is a used component. In practice, this means maintaining the factory specification, proper fitment to mounts, and compatibility with the vehicle's electrical system. Choosing such a part allows for maintaining the consistency of the charging system with other car components.

By choosing an original alternator from the secondary market, you gain:

• a component compliant with Audi's factory technical documentation,
• fitment to a specific diesel engine configuration,
• a reasonable compromise between repair cost and component quality.

Audi alternators and generators – expansion and modernization of the charging system

If you are planning a comprehensive repair or modernization of the charging system area in your Audi and need other elements from the same group, such as additional generators, alternators with different capacities, or compatible mounting sub-assemblies, check the available parts in the Audi alternators and generators category.

Technical support and knowledge about diesel engines

When selecting an alternator for a specific diesel engine, it is worth considering the characteristics of the power unit, energy demand, and the way the vehicle is used. For a comparison of manufacturers' approaches to diesel construction and the costs of their maintenance on the secondary market, the comparative material regarding BMW units may be helpful – you can find it in the article BMW N47 vs M57 / M57N / M57N2 – a ranking of legendary diesels, which shows how important the selection of appropriate maintenance components is.