Audi A4 S4 8K A5 S5 8T 8F Alternator 150A 14V 2.0 TDI Diesel CGLC 04L903017

Audi A4 S4 8K A5 S5 8T 8F Alternator 150A 14V 2.0 TDI Diesel CGLC is an original part from the Alternators and generators group, designed for Audi diesel units. This used OEM alternator ensures proper charging of the 14V system in the diesel engine, maintaining factory operating parameters and compatibility with the vehicle's electronics. It is a solution for users who expect a proven design and a perfect fit for the specific 2.0 TDI configuration.

Specifications and technical data

• SKU: 04L903017
• Mark: Audi
• Condition: Used
• OEM Part Number: 04L903017
• Substitutable numbers: 04L903017, 04L 903 017
• Fuel type: Diesel
• Part type: Alternator
• Category: Alternators & Generators

Purpose and compatibility

The presented alternator is designed for use in Audi models from the A4 / S4 8K generation and A5 / S5 8T / 8F family with a 2.0 TDI diesel engine. The OEM design guarantees proper positioning on the engine, correct routing of the accessory belt, and seamless integration with the factory charging control system.

By maintaining the original 150A current and 14V voltage characteristics, the alternator is adapted to the load typical for modern comfort systems, multimedia systems, engine control units, and other electrical consumers in premium-class Audi vehicles.

Operating parameters and role in the electrical system

The alternator in a 2.0 TDI diesel engine is responsible for the stable power supply of all vehicle systems and proper battery charging across the entire RPM range. The 150A capacity version provides sufficient power reserve for:

• injection systems and engine control units,
• active and passive safety systems,
• lighting installations,
• comfort and multimedia systems.

Selecting an alternator with the correct specification is crucial for battery longevity, voltage stability in the electrical system, and the proper operation of all electronic modules. Using an original part from the Alternators and generators group minimizes the risk of communication errors in the vehicle network and diagnostic issues.

Characteristics of the used product

The offered alternator is a used component, which allows for reduced repair costs while maintaining the factory Audi design. This type of OEM component is particularly valued in premium vehicles, where maintaining the original electrical and mechanical architecture is essential. A used alternator is a sensible choice for maintenance repairs when the priority is compliance with the factory design and predictable performance over long-term operation.

Benefits of using an original Audi alternator

Using an original alternator in an Audi A4 / S4 8K and A5 / S5 8T / 8F with a 2.0 TDI engine provides a range of practical benefits:

• Factory fit – proper mounts, pulley diameters, and electrical connectors compatible with the vehicle's installation.
• Stable charging – 150A / 14V parameters adapted to the load typical for mid-size and premium Audi models.
• Electronic compatibility – correct cooperation with control modules and diagnostic systems.
• Reduced risk of incompatibility, which often occurs with aftermarket parts having different operating characteristics.

For users who want to consciously manage service costs, a used OEM alternator represents a technically sound compromise between price and quality.

Audi alternators – expansion and modernization of the charging system

If you are planning a comprehensive repair or modernization of the engine area in your Audi and need other elements from the same group, such as alternators with different capacities, generators for other engine versions, or related accessory components, check out the available parts in the Audi alternators and generators category.

Conscious choice of used OEM parts

The growing interest in used OEM components for premium cars means that more and more drivers are choosing proven parts from dismantling instead of new aftermarket replacements. If you want to better understand why this solution is gaining importance and how it can help optimize service costs, it is worth reading the article Crisis in the new parts market? Why used originals for premium cars (BMW, Mercedes, Porsche) are the hottest trend in 2026. This will help you better assess how a used Audi alternator fits into the long-term maintenance strategy of your car.