Bosch engine management ECU that has been fully reconditioned by ATP Electronics, part numbers are 0261204767 4B0907552C or 4B0997552X as fitted to Audi A6 2.4 V6 1998-99.
This unit will need to be coded to your vehicle with suitable equipment or if you send your original unit in I can swap your coding over.
Check your original unit part number to make sure it is the same, if your not sure then send me your chassis number and engine code and I can check it out.
Unit will carry 12 month warranty.