You don't need the serial number
Just change last digit of the existing serial number.
There is no live database with which car or VCDS will check if serial number is valid.
It's as simple as changing digits.
Do a full scan with engine running after changing battery.
Then go to each module individually and clear codes that way not in one go.
Ignition off, lock the car wait couple of minutes
Fire up the engine and do a full scan again.
Battery on the last legs can cause even 10-15+ faults, even scary ones but that's where it ends. After clearing faults for the second time with new battery you'll be good to go. Only faults after that is what you should be concerned about.
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2006 D3 S8 5.2 V10
Ceramic Brakes, Bang&Olufsen, DTV, DAB, Rear Camera, BT, TPMS, Soft Close, Auto Boot, AMI , 4 Zone AC, Home Link, All Electric Blinds, Fingerprint, Ski Hatch, Black Extended Leather, Heated Sport Seats, Alacantra, Carbon Trim inc Aluminium Pack 2.
2015 A3 S line 1.4 TFSI - for the missus to keep her away from my car.
Standard S-line equipment, no extras.
2006 D3 A8 3.7 V8 - SOLD but not forgotten
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