Mk4 Golf 1.8T 2004, has an issue with a consistent check engine light probably having to deal with this. These tubes coming from the fuel injection system I believe had been open.
Mk4 Gti 1.8t Engine Bay Just Got So Much Better Looking! - YouTube
Golf MK4 1.8T 4Motion Projesi (4x4 içerir) :)
Engine / Transmission - mk4 – Page 5 – One Love Auto Group