Audi A8 D4 Aerial Antenna Amplifier Diversity 04S 4H0035225E

Audi A8 D4 Aerial Antenna Amplifier Diversity is an original component of the radio and data signal reception system, designed specifically for Audi luxury limousine models. Thanks to diversity technology, it improves reception stability, minimizes interference, and ensures a more comfortable experience when using the vehicle's multimedia and information systems. This solution is intended for users who expect efficient, factory-standard performance of the antenna installation after repair or replacement.

Specifications and technical data

• SKU: 4H0035225E
• Mark: Audi
• Condition: Used
• OEM Part Number: 4H0035225E
• Substitutable numbers: 4H0035225E, 4H0 035 225 E, 920195515, 920 195 515
• Category: Other Starters, Alternators, ECUs & Wiring

Function and role of the antenna amplifier in the Audi A8 D4

The antenna amplifier in the Audi A8 D4 is responsible for amplifying the radio and data signal received by the roof antenna and distributing it to the appropriate modules in the vehicle. Diversity technology means that the system can use multiple reception paths, selecting the one with better signal quality at any given moment. This translates into:

• more stable radio station reception while driving,
• reduction of noise and signal dropouts,
• more predictable operation of infotainment systems.

For the user, this means a smoother driving experience, without annoying interruptions in reception or the need for constant station tuning.

Compatibility and part identification

The offered amplifier is an original Audi component, intended for use in D4 generation A8 models that were factory-equipped with this type of antenna system. The part has a dedicated OEM number and associated interchangeable numbers, which facilitates clear identification and selection of the correct element for a specific vehicle configuration. Before purchasing, it is worth comparing the markings of your old part with the data in the specification to confirm full compatibility.

Condition, origin, and advantages of using OEM parts

The item comes from dismantling and is offered as a used OEM component. In practice, this means maintaining factory build quality, proper fitment to the electrical installation, and correct cooperation with original comfort and multimedia modules. Compared to replacements, the original antenna amplifier ensures:

• consistency with the electrical architecture of the Audi A8 D4,
• lower risk of communication errors in the vehicle network,
• easier installation without the need for wiring modifications.

For workshops and users, this means faster repairs and a lower risk of problems after replacement.

Installation and practical operating tips

The antenna amplifier is a bodywork installation element, usually mounted near the roof antenna or in the rear part of the vehicle. When replacing, it is recommended to:

• thoroughly check the condition of connectors and wiring harnesses,
• protect connections against moisture,
• verify the correct operation of reception after installation (radio, data systems).

Using an original amplifier in the Audi A8 D4 allows you to maintain the integrity of the entire antenna system and avoid compatibility issues that may arise with randomly selected replacements.

If you are planning a comprehensive repair or upgrade of the roof area and the rear part of the body in your Audi and need other elements from the same group, such as antenna modules, antenna bases, or additional signal amplifiers, check the available parts in the Other Audi category.

More about Audi technology and upgrade possibilities

For those interested in the performance and construction of this brand's models, including advanced drivetrain and braking systems, an article describing the differences between sports and standard versions may be useful. We encourage you to read the material Audi RS vs other models – what is hidden under the hood and chassis?, which allows for a better understanding of the Audi car design philosophy and helps in making informed choices regarding spare parts and equipment elements.

If you are considering retrofitting your VAG group car with additional features from higher trim levels, it is also worth checking out the guide Retrofitting in VAG and BMW group cars: How to cheaply upgrade your car using used parts from higher versions?, which discusses the practical aspects of using used OEM components when upgrading a vehicle.