Instruction book AUDI A1
 Audi A1   Controls   Instruments and warning/indicator lamps  Warning and indicator lamps
If the indicator lamp flashes while the Audi A1 is in motion, the ESP or traction control system (ASR) is intervening.
If the indicator lamp lights up, the ESP system has been switched off for system reasons.
Warning! Restricted stability
If the indicator lamp lights up, the ESP system has been switched off via the button Link. You can switch the ESP system back on by pressing the  button again. The system is activated when you switch on the ignition. If the indicator lamp goes out, this means the system is fully functional.
Stabilisation program and ABS fault! See Owner's Manual
If the indicator lamp and the ABS indicator lamp light up and the message appears, there is a malfunction in the anti-lock brake system or electronic differential lock. This will also cause an ESP malfunction. The Audi A1 can still be braked in the normal way (however the ABS control function will be out of action).
Drive to a qualified workshop without delay and have the fault rectified.
WARNING!
If the brake warning lamp lights up together with the ABS indicator lamp and the ESP indicator lamp, this can mean that the control function of the ABS is not working. As a result the rear wheels can lock relatively easily when braking. This could cause the tail of the Audi A1 to skid sideways. Drive carefully to the nearest qualified workshop and have the fault rectified.
Note
For more information about the ESP and ABS systems, refer to Link.

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