Audi A4   Controls  Parking aids
If you hear a long beep for a few seconds and the LED in the switch * starts flashing when you switch on the parking aid, or while the system is activated, a system fault has occurred. Have the fault rectified by a qualified workshop.
Note
If the fault is not corrected before you switch off the ignition, it will only be indicated by the flashing LED in the switch * the next time you switch on the parking aid. However, you will still hear the warning beep if you activate the parking aid by pressing the switch.

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