The BMW 3 Series, chassis code E46, was produced from 1999 to 2005 and is a compact executive vehicle renowned for its sporty handling and rear-wheel-drive dynamics, embodying BMW's philosophy of \"Sheer Driving Pleasure.\" Available in various body styles including Sedan, Coupe, Convertible, and Sport Wagon, this generation offered a wide range of inline-4 and inline-6 gasoline and diesel engines, with notable examples like the 330i and the high-performance M3. Its engineering quality is evident in its balanced weight distribution and multi-link rear suspension, contributing to its reputation as a benchmark in its class and earning accolades such as multiple Car and Driver 10Best listings and Ward's 10 Best Engines awards for its powertrains. This comprehensive Factory Service Manual provides detailed information for the maintenance, diagnosis, and repair of the BMW 3 Series E46. It covers all major vehicle systems, including engine mechanical and electrical components, transmissions (manual and automatic), suspension, steering, brakes, and the complete electrical system. The manual offers step-by-step repair procedures, overhaul instructions for engines and transmissions, troubleshooting guides, and essential technical specifications, including wiring diagrams and specialized tool requirements. Its extensive coverage ensures that owners, mechanics, and technicians have the necessary resources to maintain the vehicle's performance and reliability throughout its service life.