My dealer said that my build week would be 25th jan, however on the tracker it showed 18th. On the 14th the car started going through all the build stages on the line until quality control. However audi uk and the dealer insisted it was due to be built on the 25th, so the tracker did not leave quality control for 9 days until after the 25th. My dealer said the tracker just says your car is being built when its not and will change up until quality control when it is actually built. Cars are being built when the tracker is on quality control not before hence the long waits in qc. After QC however the tracking is pretty accurate. Ive been going by the source code of the tracker which gives more information. The tracker is highly inaccurate up until your car is actually built.