If the instrument cluster is to be replaced, it will be necessary to use a VAG 1551/1552 scan tool, 5051/5052 vehicle diagnostic testing and information system, or equivalent aftermarket diagnostic scan tool or computer program. The scan tool is used to code the instrument cluster and diagnostic interface for the data bus as well as adapting the odometer display, service interval data, vehicle immobilizer and reactivate the radio anti-theft system. If you do not have a proper scan tool or experience then it is recommended that the vehicle be taken to an authorized Audi dealer or properly equipped independent repair shop for instrument cluster replacement. For more scan tool information, additional resources are available regarding OBD On Board Diagnostics.