Keyless Entry Amplifier Audi A4 B9 A5 F5 Control Box Module Antenna 4M0907247A

Keyless Entry Amplifier Audi A4 B9 A5 F5 Control Box Module Antenna is a component from the Electronic control modules and controllers group, responsible for supporting the comfort, keyless entry function in the rear zone of the vehicle. A properly selected keyless antenna ensures stable communication between the key and the car, which translates into convenient opening and closing of the vehicle and starting the engine without using a traditional key.

Specifications and technical data

• SKU: 4M0907247A
• Mark: Audi
• Condition: Used
• OEM Part Number: 4M0907247A
• Substitutable numbers: 4M0907247A, 4M0 907 247 A
• Location on the vehicle: Rear
• Category: ECUs & Computer Modules

Purpose and function of the keyless antenna

The offered antenna is designed for the keyless entry system in Audi A4 B9 generation and Audi A5 F5 generation models, where it works with the central comfort system. This component is responsible for precise detection of the key's presence in the rear part of the vehicle, which enables the correct operation of the trunk opening function, unlocking the locks, and start authorization.

The placement on the vehicle in the rear zone allows for even signal coverage of the area around the car, minimizing dead zones and interference. Thanks to this, the keyless system works in a predictable and repeatable manner, which is important from the point of view of both comfort and user safety.

Construction and integration with vehicle electronics

The antenna belongs to the Electronic control modules and controllers group, which means it is designed for close cooperation with the vehicle's communication bus and other comfort modules. The construction provided by the manufacturer Audi ensures:

• stable operating parameters in typical vehicle operating conditions,
• properly selected transceiver characteristics for the keyless system,
• mechanical fit to factory mounting points in the rear part of the body.

Thanks to the factory specification, the antenna works with the original controller software, without the need for installation modifications or additional programming beyond the standard service procedure provided for a given car.

Benefits of using an original Audi antenna

Using an original keyless antenna in an Audi A4 B9 or Audi A5 F5 allows you to maintain the consistency of the entire electronic system. In practice, this means:

• proper cooperation with existing comfort and security controllers,
• reduced risk of communication errors and the appearance of fault messages on the dashboard,
• maintenance of factory operating parameters of the keyless entry function.

The element from this group is particularly important when diagnosing problems with key range, random lack of response to door handle touch, or incorrect trunk opening operation. Replacing the antenna with the correct, original component is often the most effective solution in the case of mechanical damage or interference in the rear zone of the vehicle.

Condition, origin, and practical application

The offered antenna comes from dismantling and is classified as a used Audi brand component, which allows combining a favorable price with maintaining factory specifications. This type of part is a good choice for post-accident repairs, replacing damaged wiring in the rear part of the body, or when solving problems with the keyless system operation without having to reach for replacements with uncertain parameters.

Before installation, it is recommended to perform standard electrical installation verification and computer diagnostics to confirm that the source of the problem is indeed the antenna, and not another module from the comfort electronics group. A correctly selected and installed component allows for restoring the full functionality of the keyless entry system in the rear part of the vehicle.

More about electronics and control modules

If you are planning a comprehensive repair or upgrade of the comfort electronics and multimedia systems area in your BMW and need other elements from the same group, such as control modules, iDrive units, or light controllers, it is worth checking out the guide describing practical aspects of working with used modules – you will find it in the article Driving pleasure for years – how to take care of iDrive systems and electronic modules in BMW 3 and 5 series models.

If you are planning a comprehensive repair or upgrade of the rear comfort electronics zone in your Audi and need other elements from the same group, such as comfort modules, central locking controllers, or additional antenna units, check the available parts in the Electronic control modules and controllers Audi category.