How do I access the hidden engineering menu on my Audi A8?

I have heard that the Audi A8 has a hidden engineering menu that allows you to access various technical settings and information. Can someone provide step-by-step instructions on how to access this menu and what features it offers?

To access the hidden engineering menu on your Audi A8, first turn on your car's ignition. On the main MMI screen, press and hold the CAR and SETUP buttons simultaneously for about 10 seconds. This should bring up the hidden menu that allows you to adjust various technical settings and access vehicle information.

Some of the features available in the hidden engineering menu include changing the headlight washers activation pressure, enabling needle sweep on startup, and adjusting volume limits for the warning chimes. Be careful when making changes in this menu as it can affect your vehicle's performance.

You may also be able to access the engineering menu by using a specific combination on the MMI knob while in the CAR menu. For example, try pressing and holding the MMI knob for 10 seconds while scrolling to the CAR menu. This may work on certain Audi A8 models.