Used car buying guide: Volkswagen Golf Mk4 (1997-2005) | Parkers
2004 Volkswagen Mk4 Golf R32 Used Car Review | Mind Over Motor
Volkswagen MK4 Common Problems – ECS Tuning
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.
VW Heritage MkIV Golf buying guide - Heritage Parts Centre
Volkswagen Golf MK4 - Everything You Need to Know About One of the Best, Most Boring Cars Ever Made
11 most common issues on Volkswagen Golf 5 Mk5 & Jetta