What are the most comprehensive hidden features of the 2021 Audi A3?

[EmeryLynn]

Audi A3 hidden features include: 1. Locking sound: When the doors are properly closed, pressing the unlock or lock button on the key fob will trigger a sound prompt, making it convenient for the owner to confirm whether the doors are closed and to locate the car in a crowded parking lot. 2. Disabling start-stop: The start-stop function can be permanently disabled, and it cannot be reactivated by adjusting the start-stop button. To re-enable it, an OBD tool must be used to reset it to the default state. 3. Sporty needle sweep: This is a self-test behavior of the instrument cluster during startup. After the vehicle is completely powered off and restarted, the instrument needles will sweep around once. The sporty needle sweep is stylish and elegant, adding a sporty feel reminiscent of a sports car. 4. Startup screen: The Audi vehicle system comes with several built-in startup screens. The default factory setting is the classic startup screen, but it can be switched to other options. 5. Turn signal light tap flash count setting: The factory default setting for a light tap of the turn signal lever is three flashes, which may be too few and could lead to misjudgment by following vehicles during lane changes or turns, potentially causing rear-end collisions. The number of flashes can be adjusted to four or five for safer driving. 6. Same-side taillight illumination when opening doors: When a door is opened, the taillight on the same side will illuminate to alert vehicles behind. 7. Ambient light coding: Activates the factory ambient light color and brightness adjustment interface. After activation, additional ambient light hardware must be installed for full functionality. 8. Rearview camera programming: Some vehicles do not come with a rearview camera. After installing one, the rearview camera function must be activated via software to display the rearview image on the screen when reversing. 9. Seatbelt warning sound: The factory setting includes an audible alert when the seatbelt is not fastened while driving. This sound can be disabled (please comply with traffic laws and regulations). 10. Single-door unlock: By default, pressing the unlock button once opens all four doors. After activation, it can be set to unlock only the driver’s door with one press, and all four doors with a second press. Alternatively, it can be set to unlock only the two doors on the driver’s side with one press and all four doors with a second press. 11. Reverse light brightness adjustment: The factory setting is level 5 brightness, equivalent to 67% of maximum brightness. Increasing the brightness improves visibility in the rearview camera and mirrors when reversing at night. 12. Automatic downward tilt of the right-side mirror when reversing: Activates the right-side mirror to tilt downward at a certain angle when reversing, allowing the driver to better see the right-side environment. 13. Daytime running light display: Enables the daytime running light on/off option to appear in the central control system settings for adjustment. 14. Home lighting function: After locking the car, the lights remain on for about 10 seconds before automatically turning off. This illuminates the path home at night, hence the name "home lighting assist." Settings include choosing between fog lights or low beams for illumination, adjusting the duration, and deciding whether the lights turn on after the engine is turned off or after the door is closed. 15. Fog light steering assist: By default, only the turn signals flash when the steering wheel is turned. After activation, the fog lights can also be set to turn on as auxiliary steering lights. 16. Alternating taillight and turn signal flashing: By default, only the turn signals flash when the turn signal lever is activated. After activation, the taillights and turn signals can be set to flash alternately. 17. Manual window control after engine shutdown: Normally, window controls are disabled after the engine is turned off and the door is opened. After activation, the windows can still be adjusted manually in this state. 18. Video playback while driving: By default, video playback is disabled while the vehicle is in motion. This restriction can be removed to allow video playback during driving.