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Probably you did had problems when tried to replace damaged Renault injection control unit. From the year 1994 most Renault cars are equipped with engine immobilizer system and it makes replacement of injection computer more complicated. There is no problem if replacement ECU is bought from Renault service dealer - it is sold with no immobilizer code stored, but replacing damaged computer with used one is impossible because of mismatch of unlocking codes.
After selecting the correct manufacturer, car model and specific electronic system you are able to view component photos and additional instructions. It is possible to obtain immobilizer data from the vehicle. The next step is to repair the package by clicking on the corresponding button. Fixed files can be uploaded to the car via the same hardware controller.