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 2006 Audi TT
2006 Audi TT
2006 Audi TT Problems
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Vacuum leaks, oxygen sensor failure, and catalytic converter efficiency faults can cause the Check Engine Light to illuminate.
A creaking type noise may be noted from the front suspension. Replacement of the front sway bar may be required to correct this issue.
Engine oil leaks are common from the valve cover gaskets and camshaft chain tensioner gasket.
To avoid sludge accumulation inside the engine, our technicians recommend using the proper synthetic oil with the appropriate oil filter.