Erratic turn signal operation can be a result of a failing turn signal flasher relay which will require replacement.
Car problem reports
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Most reported 2008 Audi TT 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.
2.0L turbo charged engines may develop a hesitation on acceleration and/or illumination of the Check Engine Light due to a failed high pressure fuel pump or a worn camshaft follower or camshaft. Our technicians tell us that whenever the high pressure fuel pump is replaced the camshaft and the follower should be checked for wear. The camshaft lobe pushes on the follower to operate the high pressure fuel pump. Frequent oil changes and use of synthetic oil may help with this wear issue.