This manual covers the Astra, generation G (Mk.IV), produced from 1998 to 2000. This compact family car, available in 3-door and 5-door hatchback, 4-door saloon, 5-door estate, and 2-door coupe/convertible body styles, was known for its comfortable ride, practical interior, and value for money, positioning it as a strong competitor against models like the Ford Focus and Volkswagen Golf. It offered a range of petrol engines from 1.4L to 2.0L turbo, as well as diesel options, with horsepower typically ranging from 60 to 200 HP. The Astra G featured a robust chassis, with T98 designation for saloon, hatchback, and estate, and E03 for coupe/convertible variants, and was equipped with safety features such as ABS and optional side airbags. This comprehensive workshop service and repair manual provides detailed information for owners, mechanics, and technicians. It covers all major systems, including engine mechanicals, fuel injection, ignition, transmission (manual and automatic), brakes, suspension, steering, electrical systems, bodywork, HVAC, and safety systems. The manual includes routine maintenance procedures, step-by-step repair instructions, overhaul guides for engines and transmissions, troubleshooting diagnostics, and detailed wiring diagrams. With hundreds of pages of content, it offers in-depth coverage suitable for professional technicians and experienced DIY enthusiasts, enabling effective maintenance, repair, and problem diagnosis for the Astra models from 1998-2000.