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The turn indicator relay in an Audi TT is integrated with the hazard switch. To replace the relay you would need to replace the hazard switch.
in my 2001 A4, it was the hazard light switch that had to be replaced. maybe thaqt's your issue also
its the hazard switch, its all one unit
It's in the hazard warning switch. You need to replace the switch.
This seems to be a cammon fault with VW/Audi cars. U will need to replace the hazard light switch mechanism which contains the switching contacts. I had to replace same in my last cars (VW/Audi)
2002 Audi quattro 1.8 ignition module location
My research to date finds that the turn signals and hazard signals are controlled by a common relay. That relay is behind the hazard relay switch. My 2002 Audi A6 has the same symptoms you describe, and I will be removing the hazard switch to get at the relay for replacement. Good luck.
The hazard rely may need replacing. Look under hood close to battery, remove old relay switch and replace with new.
Inside the hazard switch.
behind the hazard button, its built as complete assembly for Turn/hazard signal
The turn and hazard flasher relays are incorporated into hazard switch.
you go.... and replace it!