Very old project, but sometimes can be useful. Fast, easy and cheap solution for emulate immobiliser in case of defect Immo Box, Transponder Coil etc. in old VAG vehicles (Immo-1 and Immo-2). Presented solution is used from many years. It has some drawbacks, but is simple, tested and working. Project based on AT89C2051 microcontroller and can be modified in many ways. Working emulator, in the basic version can be assembled within several minutes.