If your 1.5 TSI has a vacuum noise or a sound like bubbling/gurgling, open the engine cover and be sure to check these pipe connections. The part is listed as the tank ventilation hose.
Translated from Turkish
If your 1.5 TSI has a vacuum noise or a sound like… — @dorian
For now I've solved the problem with a used hose; if you try to get the original hose, FYI they're asking around 13,000₺.
Translated from Turkish·