How do I access the hidden menu in my Audi A4?

I want to access the hidden menu in my Audi A4 to check for any diagnostic codes, but I'm not sure how to do it. Can someone guide me step-by-step on how to access it and what options are available in the menu?

To access the hidden menu in your Audi A4, turn on the ignition and press and hold the CAR and MENU buttons simultaneously for 5 seconds. You will then be able to navigate through different options such as battery voltage, oil temperature, and diagnostic codes. Don't worry if some options seem unfamiliar, they are mostly meant for advanced users.

I've found the hidden menu to be quite useful in diagnosing any potential issues in my Audi A4. One important thing to note is that you should only access and make changes to settings in this menu if you know what you're doing. Otherwise, it's best to leave it alone and take your car to a professional mechanic.