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.
Engine VW GOLF IV (1J1) 1.8 T 5883962 | B-Parts
BUILDING A 300bhp! GOLF MK4 GTI 1.8T FINAL (PART 5 OF 5 ) - YouTube