Good morning René.
The GDI engine is known as the Ti-VCT (GDI) 2 Litre it was the engine supplied for the Ford Focus in America from 2012 - 2018.
If you google "2012 Ford Focus S.E" and "2012-2017 Ford Focus 2.0L Duratec GDI" you will find information on cleaning MAF sensor, cleaning throttle body, removing spark plugs etc.
I hope this helps.
