Audi A4   Controls   Instruments and warning/indicator lamps  Warning and indicator lamps
The warning and indicator lamps light up or flash in the instrument cluster to indicate functions or faults.
Some of the warning and indicator lamps may be accompanied by a driver message. The warning display will be accompanied by the corresponding warning chime. The messages disappear again after a short time. To display a message again, press the SET button Link. If several malfunctions occur, each of the indicator/warning lamps will be displayed in succession for about two seconds at a time.
Depending on the vehicle equipment, some of the warning and indicator lamps may be displayed in different colours.

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