Erratic turn signal operation can be a result of a failing turn signal flasher relay which will require replacement.
Problems for specific Audi TT Quattro years:
Car problem reports
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Most reported 2004 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.
To avoid sludge accumulation inside the engine, our technicians recommend using the proper synthetic oil with the appropriate oil filter.