Volkswagen Golf GTI 2016, Owner'S Manual

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If the indicator light comes on or you see a text message in the
instrument cluster display indicating that the fuel filler cap is not
properly closed, stop the vehicle in a safe place and switch off the
engine and the ignition.
Open the fuel filler flap and take the fuel filler cap off the filler neck.
Then put the fuel filler cap back on the filler neck and screw it on
clockwise until you clearly hear a clicking sound. Close the fuel filler
flap.
After switching on the ignition, the indicator light may stay on or
the text message may still appear in the instrument cluster display,
even if the fuel filler cap is now properly closed. This is normal and
no reason to take your vehicle in for service.
If, however, the malfunction indicator light also comes on, drive
to your nearest authorized Volkswagen dealer or authorized
Volkswagen Service Facility and have the fuel system and the
engine checked.