Audi A3 8V Front Headlight LED Lens Headlamp Unit Left N/S 90078818 9011021000W2

Visual condition of the part

The product shows signs of use visible in the photos.

Audi A3 8V Front Headlight LED Lens Headlamp Unit Left N/S is an original component from the Ballasts and igniters for lamps group, designed for precise operation within the factory lighting system. It ensures stable power supply and control of the LED light source on the driver's side, which translates into a safe, uniform light beam and proper headlight functionality.

Specifications and technical data

• SKU: 90078818
• Mark: Audi
• Condition: Used
• OEM Part Number: 90078818
• Substitutable numbers: 90078818, 9011021000W2
• Location on the vehicle: Front, Left
• Category: Headlight Ballasts & Ignitors

Application and function in the lighting system

The presented module operates in the front headlight on the left side of the vehicle, responsible for controlling and stabilizing the LED diodes. As a component dedicated to a specific generation of the Audi A3 8V, it works with the electrical installation and body electronics in accordance with the manufacturer's specifications, which reduces the risk of system errors and unwanted dashboard warnings.

By using an original component from the same group to which ballasts and igniters belong, the proper light characteristics of the headlight are maintained, as well as the correct operation of the low and high beam functions in the given module.

Benefits of using an original module

Choosing a used, original element from the Ballasts and igniters for lamps category allows you to maintain the consistency of the lighting system with the factory Audi specification. This solution is particularly beneficial when you want to:

• maintain compatibility with factory light control and vehicle electronics,
• reduce the risk of communication problems in the CAN network,
• preserve the predictable, repeatable lighting characteristics of the LED headlight,
• economically restore the efficiency of the lighting system on the driver's side.

The used element allows for a technically correct repair without the need to resort to replacements with uncertain parameters, which is important for both driving safety and the durability of the entire headlight.

Selection and installation in the Audi A3 8V

The module is designed for installation in the front headlight on the left side, so when selecting, it is worth paying attention to compatibility with the LED headlight version used in your Audi A3 8V. A properly selected component facilitates installation and allows for minimizing adaptation work, which is especially important during service performed in workshop conditions.

Due to the nature of the electronic component, installation by a person with experience in working with LED lighting systems is recommended, which reduces the risk of damage to the installation and the headlight itself.

Expanding lighting system upgrades

If you are planning a comprehensive repair or upgrade of the front lighting zone in your Audi and need other elements from the same group, such as control modules, converters, or igniters, check the available parts in the Audi ballasts and igniters for lamps category.

Technical knowledge and operation

When working with lighting electronics, it is worth paying attention to symptoms typical of LED headlight power supply failures, such as flickering, intermittent dimming, or light error messages. For drivers who want to better understand the principles of operation and repair of electrical components in a car, a practical guide on our blog may be helpful: When is it worth replacing an alternator with a used one: a practical guide for drivers. Although it concerns a different component, it explains key issues related to the diagnostics and selection of used electrical elements in a vehicle.