🏷️ Basic Information Identification Make: BMW Model: 3 Series Chassis Code: E46 Model Year: 2003 Codes Vin Designation: WBA Engine Codes Covered: N42B20, M54B22, M54B25, M54B30, M47TUD20 Body Styles Covered: Sedan (E46/4), Coupe (E46/2), Convertible (E46/C), Touring (E46/3), Hatchback (E46/5 - 3 Series Compact) 👋 Introduction Market Position Positioning: The BMW E46 (1998-2006) was a highly successful premium compact executive car, praised for its driving dynamics, build quality, and sophisticated engineering. The 2003 model year represents a significant point in its lifecycle, often featuring mid-cycle updates. Competitive Analysis Competitors: Competed directly with the Mercedes-Benz C-Class (W203), Audi A4 (B6), Lexus IS, and Infiniti G35. The E46 was often lauded for its superior handling and driver engagement compared to many rivals. Key Features Design: Iconic BMW design language, excellent weight distribution, driver-focused interior. Performance: Renowned for its balanced handling, responsive engines, and engaging driving experience, especially in M Sport variants. Reliability: Generally considered reliable with proper maintenance, though specific E46 common issues are well-documented. 📋 Manual Details Coverage Areas Primary Coverage: Comprehensive repair and service procedures for the 2003 BMW E46 generation. Specific Areas: Engine, Drivetrain, Suspension, Steering, Brakes, Electrical System, Climate Control, Bodywork, Diagnostics. Page Count Estimated Pages: 1000+ Manual Type Type: Factory Service Manual (FSM) / Repair Manual Language Language: English Format Format: Digital (PDF) 📖 Manual Coverage Systems Covered Powertrain: Engine mechanicals, fuel injection, ignition, exhaust, cooling, lubrication, engine management (DME), automatic and manual transmissions, clutch, driveshafts, differentials, axles. Chassis: Front and rear suspension (McPherson struts, multi-link), steering system (rack and pinion, power steering), brake system (ABS, DSC, rotor/pad replacement, caliper service), wheel bearings, subframes. Electrical: 12V battery system, alternator, starter, lighting (headlights, taillights, interior), power windows/locks, central locking, instrument cluster, warning indicators, fuse and relay locations, basic wiring diagrams. Body Interior: Body panel removal/installation, door mechanisms, interior trim, seats, dashboard, bumpers, trunk lid, hood. Climate Control: HVAC system operation, refrigerant handling, blower motor, heater core, A/C compressor, control modules. Procedures Included Maintenance: Oil and filter changes, coolant flushes, spark plug replacement, air filter replacement, brake fluid service, fuel filter replacement, drive belt inspection/replacement, battery testing. Diagnostics: Troubleshooting guides, fault code interpretation (OBD-II), common symptoms and causes, diagnostic procedures for various systems. Repair Rebuild: Engine disassembly and reassembly, transmission overhaul, brake caliper rebuilding, suspension component replacement, steering rack replacement, alternator/starter replacement, fuel pump replacement. Installation Adjustment: Accessory installation, sensor replacement, component calibration, headlight alignment, suspension alignment specifications. Technical Depth Depth: Highly detailed, covering everything from basic fluid checks and filter replacements to complete engine and transmission rebuilds. Includes torque specifications, clearances, and diagnostic flowcharts. 📊 Manual Specifications File Format Type: PDF Searchability: Text-searchable for quick information retrieval. Resolution: High-resolution scans of original factory documentation for clear diagrams and text. Printability: Printable pages for on-hand reference in a workshop environment. Print Quality Quality: N/A (Digital Format) Binding Type Type: N/A (Digital Format) Paper Type Type: N/A (Digital Format) ⚙️ Engine Specifications Primary Engine 2.5L Inline-6 (M54B25): Displacement: 2494 cc (2.5L), Bore x Stroke: 84 mm x 75 mm, Compression Ratio: 10.2:1, Horsepower: 189 hp @ 6000 rpm, Torque: 181 lb-ft @ 3500 rpm, Engine Code: M54B25 3.0L Inline-6 (M54B30): Displacement: 2979 cc (3.0L), Bore x Stroke: 84 mm x 89.6 mm, Compression Ratio: 10.2:1, Horsepower: 225 hp @ 5900 rpm, Torque: 214 lb-ft @ 3500 rpm, Engine Code: M54B30 2.0L Inline-4 (N42B20): Displacement: 1995 cc (2.0L), Bore x Stroke: 82 mm x 94.6 mm, Compression Ratio: 10.0:1, Horsepower: 143 hp @ 6200 rpm, Torque: 147 lb-ft @ 3750 rpm, Engine Code: N42B20 2.0L Diesel (M47Tud20): Displacement: 1995 cc (2.0L), Bore x Stroke: 84 mm x 90 mm, Compression Ratio: 18.0:1, Horsepower: 150 hp @ 4000 rpm, Torque: 236 lb-ft @ 1750 rpm, Engine Code: M47TUD20 Performance Redline: Typically 6500 rpm for M54 engines, 6200 rpm for N42. Engine Management: Bosch Motronic (e.g., ME7.x for gasoline, EDC16 for diesel). Fuel System Fuel Delivery: Electronic Fuel Injection (EFI), often with a Bosch Motronic control unit. Fuel Type: Premium Unleaded Gasoline (91 AKI or higher recommended for M54), Diesel for M47. Fluid Specifications Engine Oil: BMW Longlife-01 (LL-01) certified synthetic oil, e.g., 5W-30 or 0W-30. Check specific model requirements. Coolant: BMW Blue Antifreeze/Coolant (G48 ethylene glycol based) mixed 50/50 with distilled water. 🔧 Transmission Standard Transmission Type: 5-speed Manual Getrag GS53Z (for most gasoline models) or ZF 5HP19 automatic (for most gasoline models). Optional Transmission Type: 6-speed Manual Getrag SG170 (for select high-performance models like 330i ZHP), Steptronic automatic (5-speed ZF 5HP19TU). Features Clutch: Hydraulically operated single dry plate clutch for manual transmissions. Automatic Features: Sport and Steptronic modes allowing manual gear selection via shifter or steering wheel buttons (on some models). Fluid Specifications Manual Transmission Fluid: BMW MTF LT-2 or equivalent (e.g., Pentosin MTF2). Check specific manual for viscosity. Automatic Transmission Fluid: BMW ATF LT-71141 (for ZF 5HP19) or BMW ATF...