How do I activate the Audi A1's parking sensors?

I just bought an Audi A1 and can't seem to figure out how to activate the parking sensors. I've tried pushing buttons on the dashboard but nothing seems to work. Any tips?

To activate the parking sensors on an Audi A1, simply press the PDC button located on the center console. This will turn on the sensors and display their readings on the infotainment screen.

If you're having trouble finding the PDC button, it may be because your Audi A1 is equipped with the optional parking assistance package. In this case, simply press and hold the ON/OFF button for a few seconds to activate the sensors.

In addition to pressing the PDC button, you can also activate the parking sensors by shifting into reverse gear. This will automatically turn on the sensors and display their readings on the infotainment screen.