Assuming you're still looking at the cluster:
http://wiki.ross-tech.com/wiki/index.php/Audi_A6_(4F)_Instrument_Cluster_(through_MY_2008)#Coding
Code:
????xxx: Options
+0001 = Quattro (Standard)
+0002 = w/o Driver Information System (DIS)
+0004 = Vehicle with Clutch (NO Automatic)
+0008 = Second Tire Size Pair
+0016 = Tire Pressure Monitoring
+0032 = Adaptive Air Suspension
+0064 = Advanced Frontlighting System (AFS)
+0128 = Adaptive Cruse Control (ACC)
+0256 = 70-Liter Fuel Tank (only Front-Wheel-Drive)
+2048 = Switch Option for Bord Computer Levels (MY 2006+)
xxxx?xx: Country
0 = Germany
1 = Rest of World (Left-Hand-Drive)
2 = USA
3 = Canada
4 = Great Britain
5 = Japan (Left-Hand-Drive)
6 = Arabian States
7 = Australia
8 = Rest of World (Right-Hand-Drive)
9 = Japan (Right-Hand-Drive)
xxxxx?x: Seatbelt Warning (3-6 = MY 2005+ only)
0 = No Seatbelt Warning
1 = Seatbelt Warning (EU-NCAP)
2 = Seatbelt Warning (NAR Old)
3 = Seatbelt Warning (NAR New)
4 = Seatbelt Warning (EU-NCAP incl. Passenger)
5 = Seatbelt warning (NAR Old incl. Passenger)
6 = Seatbelt Warning (NAR New incl. Passenger)
xxxxxx?: Illumination
0 = Needles OFF and Scales OFF (Term. 15 ON / Term. 58 OFF)
1 = Needles ON and Scales OFF (Term. 15 ON / Term. 58 OFF)
2 = Needles OFF and Scales ON (Term. 15 ON / Term. 58 OFF)
3 = Needles ON and Scales ON (Term. 15 ON / Term. 58 OFF)
...the ? refers to which digits of the coding the data applies to, so for example the first 4 digits are the options.
The + signifies you add the numbers together of all the systems fitted to the vehicle.
The numeric options increase exponentially, so whatever combination of options you choose will always lead to a unique number.
So if you had Quattro, a clutch and for example, the coding for the first 4 digits would be 0001 + 0004 + 0128 = 0133
Code:
+0001 = Quattro (Standard)
+0004 = Vehicle with Clutch (NO Automatic)
+0128 = Adaptive Cruse Control (ACC)
The other digits are just integer options, so if your car is a Swedish left hand drive model, digit 5 would be 1, etc.
Code:
xxxx?xx: Country
1 = Rest of World (Left-Hand-Drive)