Loud 'Popp' ... (Solution)

... followed by a significant loss of power and massive black smoke; A pressure hose from the turbocharger system may have come loose. To protect the turbocharger, drive with very little gas, and stop as soon as possible to avoid "real" damage such as broken pipes or dirt being sucked into the engine.
After the inspection, check if the LLK - pipe connection (the rubber hose) is properly reattached. Several people (including myself) have experienced that this connection, surprisingly, always comes loose shortly after the inspection. Improvement suggestion: instead of the quick-release fastening for the hose, attach a hose clamp with adjustable thread. He holds it securely.

Author: Mr. Huber