The Volkswagen Golf and Jetta Mk4, built on the A4 platform, represent a significant era for Volkswagen, known for their solid engineering and refined driving experience. Produced between approximately 1997 and 2006, these models, including those equipped with the 2.0-liter AEG engine, offered a blend of practicality and German automotive quality that made them popular choices. The platform was recognized for its handling and build, often appearing on industry accolades, and provided a foundation for a wide range of comfort and safety features.

This manual serves as a comprehensive guide to the electrical system and wiring diagrams for the Volkswagen Golf/Jetta Mk4, specifically focusing on aspects relevant to the AEG engine. It details critical electrical components, including the Engine Control Module, fuel injection, ignition, lighting, power accessories, and safety systems. The manual provides in-depth troubleshooting procedures, component testing methods, and clear wiring identification, including wire colors, pinouts, and harness routing, empowering technicians and owners to accurately diagnose and resolve electrical issues.