It allows changing the VIN registered in the instrument cluster to match the car after a dashboard swap. Supported Vehicles (General Range) VW Golf Mk4, Passat B5, Bora, Polo, Beetle (Older models) Audi A3/A4/A6 (Up to early 2000s) Skoda Octavia I, Fabia Seat Leon, Ibiza How to Use VAG EEPROM Programmer 1.20 Prerequisites
Allows editing of the Vehicle Identification Number in the immobilizer. Why Choose Version 1.20?
The built-in Hex/ASCII viewer/editor received enhancements, making manual data analysis more straightforward. Additionally, the cluster mileage setting routine was corrected for better accuracy on specific module types. The interface in version 1.20 also features a larger window (showing six more lines of data than previous versions) and an optimized color design. vag eeprom programmer 1.20
The stability of IMMO functions was a major focus. Version 1.20 introduced safer write operations with checksum validation , reducing the risk of corrupting module data. It also improved the reliability of reading Login codes (PINs) and CS (Component Security) data, which are essential for key programming.
: Beyond specialized tasks, it can read and clear standard engine and SRS airbag error codes. It allows changing the VIN registered in the
: While native to older systems, it can work on Windows 10/11, though some users report needing to disable Driver Signature Enforcement or white-listing the app in Windows settings to avoid "ECU Not Found" errors. AliExpress Pros and Cons
To connect the software to your vehicle, you will need a K-Line diagnostic adapter . The most common and affordable option is a KKL cable (often marketed as a VAG-COM 409.1 KKL cable) or a VAG K+ Commander cable (version 1.4 is often cited as working well). Once connected via USB, the software needs to communicate with the virtual COM port assigned to the adapter. Version 1.20 has improved handling of USB-serial latency, making it more forgiving than previous versions. The stability of IMMO functions was a major focus
The program does not utilize proprietary, high-end hex interfaces. Instead, it relies on a standard built with an authentic FTDI FT232RL or CH340 serial chip. Operating System Compatibility
Version 1.20 is a notable update, building upon the classic functionalities of earlier versions (like 1.18p and 1.19) by expanding its capabilities, improving stability, and offering better compatibility with modern Windows operating systems (7/8/10/11). The software is designed to be straightforward, but it is a powerful tool that must be used with a thorough understanding of the risks, as it can permanently alter your vehicle's data.