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.
Gearbox Volkswagen Golf IV 1.8 20V Turbo - AGU DBZ
Assembled By ECS - 018163ECS03 - Build-Your-Own MK4 1.8T Performance Cooling System Refresh Kit