Mercedes-Benz A Series Owner's Manual page 131

Controls
Driving systems
Activating/deactivating the ECO start/
stop function
To activate/deactivate the ECO start/
1
stop function
Indicator lamp
2
128
If indicator lamp 2 is off, the ECO start/stop
function is deactivated. The engine will then
not be switched off automatically when the
vehicle stops.
i
The next time that the engine is started
using the key, the ECO start/stop function
is automatically reactivated.