VW Touran Turbo Sensor: Faulty or Inaccurate?

Evening.

I have a VW Touran 1T that occasionally throws an error. The glow plug indicator light illuminates on the instrument cluster, and the display shows "Engine Malfunction."
I've already replaced the boost pressure sensor twice, and then it lasted for about 6 months each time.
The wiring appears to be okay, with no signs of chafing or similar issues.
Do you have any suggestions for me about what else I could do?

Best regards,
Thilo

Sporadic errors are always annoying.

Is the mass airflow sensor stable and not malfunctioning?

The problem can only be caused by the sensor itself, its wiring, or the motor control unit.

Best regards, Rainer.