Erratic turn signal operation can be a result of a failing turn signal flasher relay which will require replacement.
Resources for the Repair and Maintenance of your 2008 Audi TT Quattro
2008 Audi TT Quattro
2008 Audi TT Quattro Problems
A creaking type noise may be noted from the front suspension. Replacement of the front sway bar may be required to correct this issue.
2008 Audi TT Quattro Recalls (Recent)
RepairPal Expert Overview:
The retainers clips for the C-pillar trim panels may not retain the panels sufficiently. In a collision, the trim panel may become a projectile and injure an occupant. Dealers will install an improved retainer clip. The Audi recall number is 70D1/JX. This recall began on March 7, 2008.