Is this a new shape A6?
TMC was enabled on the new A6 (C6) around late 2005, I think build week 25.
Two requirements
1. MMI version 2120
2. MMI nav disk ending in AF minimum.
Check your MMI revision by pressing CAR, then VERSION, read the line along the top.
On the old shape A6 (C5) with RNS-E (DVD in the dash) then TMC was enabled Jan 2007 by installing the M revision DVD disk for RNS-Eh
From what I have seen, none of them have TMC written on the disks.
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