Audi A4 B8 Ignition Switch Lock Barrel Control Module Unit With Key 8K0909131C

Audi A3 B8 Ignition Switch Socket Reader with Key is a component from the Ignition Accessories group, designed for the starting system in Audi vehicles. The integrated socket with key reader ensures precise cooperation with the vehicle's electronics, enabling efficient engine starting and immobilizer operation.

Specifications and technical data

• SKU: 8K0909131C
• Mark: Audi
• Condition: Used
• OEM Part Number: 8K0909131C
• Substitutable numbers: 8K0909131C, 8K0 909 131 C
• Category: Ignition Modules

Purpose and Function in the Ignition System

The ignition switch with socket and key reader is responsible for secure start authorization and transmitting signals to the vehicle's control modules. In practice, this means:

• handling key positions (accessory power, ignition, start),
• cooperation with the vehicle's security system (immobilizer),
• stable connection of the mechanical part of the key with the car's electronics,
• correct signal transmission to the electrical system.

This ensures that the ignition system operates predictably, and the driver can be confident that the start-up process is carried out according to the manufacturer's specifications.

Construction and Usability Features

The combination of the socket, reader, and key in a single unit simplifies servicing and replacement of the component in the vehicle. This type of solution provides:

• mechanical and electrical consistency of the entire ignition switch assembly,
• proper key guidance in the socket, minimizing the risk of jamming,
• adaptation for cooperation with the factory Audi wiring harness,
• the possibility of use in the repair or restoration of the ignition system.

The component comes from an Audi vehicle, which helps maintain compliance with factory manufacturing standards and system logic.

Product Condition and Service Application

The offered ignition switch with socket and key reader is a used part, making it an attractive solution for repairs where cost optimization while maintaining proper functionality is important. This type of component is particularly suitable in situations such as:

• mechanical failure of the ignition switch (wear, socket damage),
• problems with the reader recognizing the key,
• the need to replace the assembly as part of post-accident repairs,
• restoring the completeness of the vehicle's ignition system.

Choosing a used component allows for maintaining consistency with the vehicle's original electrical architecture, which is important when working with security systems.

Benefits of Using an Original Audi Component

Using an ignition switch with socket and reader from Audi translates into a number of practical benefits:

• factory fit to the wiring harness – no need for modifications to wiring or adapters,
• maintaining the ignition system's operation logic as intended by the manufacturer,
• greater predictability of the immobilizer system's operation compared to aftermarket alternatives,
• possibility of use in professional service repairs and in workshops specializing in the Audi brand.

This approach is particularly important in vehicles where electronics play a key role in safety and driving comfort.

If you are planning a comprehensive repair or upgrade of the ignition system area in your Audi and need other parts from the same group, such as coils, wires, or control modules, check the available parts in the Audi Ignition Accessories category.

If you are considering broader use of premium used components in your car and want to better understand the advantages of original dismantled parts, it is worth reading the article Used Mercedes Parts – Original Dismantled Parts, which discusses the practical aspects of such a solution.