@Betty02 you should try VCDS scan. The system works by detecting a change in rolling resistance of one or more tyres as compared to the others. In a puncture, the rolling resistance increases at the affected corner & the system will see this & alert you. I think it uses the ABS sensors for this.
If all four wheels are changed & the rolling resistance of all are the same it can 'fool' the system into thinking there is no change, as no differential is noted between all four. I ve forgotten to reset after changing to winter tyres & wheels and it was several days before I got a warning.
The chances of the driver not noticing 4 punctures is very low, so that is why a comparative method is used. It isn't a true pressure monitor, in that is doesn't physically measure the inflated pressure, just the rolling resistance when you tell it with the button that pressures are correct. A deviation too far from your 'set' normal will alert the system.