Vigilance Luscious fight golf 4 1.8 t happiness Semblance let's do it
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.
Volkswagen Golf IV 1.8T Parts & Upgrades | OEM & Performance Parts
Why the MK4 GTI 1.8t is a Perfect Project for 2019 – ECS Tuning