To reset the 2014 Seat Leon service interval display, please follow these instructions:
Turn the ignition off.
Press and hold the 0.0/SET button.
Continue to hold and turn the ignition on (do not start the engine).
Release the 0.0/SET button.
Press the 0.0/SET button again and hold for 20 seconds.
Release the button.
Re-start the engine to verify the indicator has been reset.