Audi RS Q3   Controls   Driving  Start/stop system
Applies to vehicles: with start/stop system
Stop the vehicle and keep your foot on the brake pedal. The engine will switch off. The indicator lamp will appear on the display.
The engine will start again automatically when you take your foot off the brake pedal. The indicator lamp will go out.
Further information
The engine will stop if the selector lever is in position P, D or N. If the selector lever is in position P, the engine will remain off even if you take your foot off the brake. The engine will not start again until you select another gear and take your foot off the brake.
The engine will start again if you move the selector lever to R during a stop phase.
If you do not want the engine to start, move the selector lever quickly from D through R to P.
You can control whether or not the engine is switched off by varying the amount of pressure on the brake pedal. For instance, if you brake gently in stop-and-go traffic or before turning off at a junction, the engine will remain on while the vehicle is at a standstill. As soon as you press the brake pedal harder, the engine will be switched off.
Note
When you stop and the start/stop system turns off the engine, the ignition remains on. Before leaving the vehicle, ensure that the ignition is switched off.

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