🏷️ Basic Information Identification Make: BMW Model: 325i Model Variant: 325 Year: 2003 Codes Chassis Code: E46 Engine Code Typical: M54B25 👋 Introduction Market Position Segment: Compact Executive Sedan/Coupe/Convertible Target Audience: Luxury vehicle buyers seeking sporty driving dynamics and premium features. Competitive Analysis Key Competitors 2003: Audi A4, Mercedes-Benz C-Class, Lexus IS300, Infiniti G35 Key Features Driving Dynamics: Renowned for its balanced chassis, rear-wheel-drive bias, and engaging steering. Powertrain: Smooth and potent inline-six engines, offering a refined power delivery. Interior Quality: High-quality materials and typically driver-focused ergonomics. 📋 Manual Details Coverage Areas Primary Coverage: Service, Repair, Maintenance, Diagnostics, Troubleshooting, Electrical Systems, Mechanical Systems, Bodywork Secondary Coverage: Specifications, Torque Values, Wiring Diagrams, Component Locations Page Count Estimated Pages: 1500+ Manual Type Type: Factory Authorized Service and Repair Workshop Manual Language Language: English Format Format: Digital (PDF) 📖 Manual Coverage Systems Covered Powertrain: Engine (M54B25), Cooling System, Fuel System, Exhaust System, Lubrication System Drivetrain: Transmission (Manual & Automatic), Clutch, Drive Shaft, Differential, Axles, Wheel Bearings Suspension Steering: Front Suspension, Rear Suspension, Steering System, Power Steering Brakes: Brake System (Hydraulic, ABS, DSC), Brake Pad Replacement, Rotor Replacement, Caliper Overhaul Electrical: Battery, Charging System, Ignition System, Lighting System, Power Windows, Mirrors, Seats, Instrument Cluster, ECU, DME, Wiring Diagrams Body Chassis: Body Panels, Doors, Hood, Trunk, Bumpers, Interior Trim, Seats, HVAC System, Restraint Systems (Airbags) Procedures Included Routine Maintenance: Oil Changes, Filter Replacements, Spark Plug Replacement, Fluid Checks and Top-offs, Belt Inspections Major Repairs: Engine Overhaul, Transmission Rebuild, Suspension Component Replacement, Brake System Overhaul, Electrical Component Diagnosis and Repair Diagnostics: Troubleshooting Fault Codes (DTCs), Symptom-based Diagnostics, Component Testing Procedures Technical Depth Depth: Comprehensive diagnostic and repair procedures, including detailed specifications, torque values, and step-by-step instructions for professional mechanics and advanced DIY enthusiasts. 📊 Manual Specifications File Format Searchability: Fully searchable PDF with clickable table of contents and cross-references. Printability: Printable pages for convenient workshop use. Print Quality Image Resolution: High-resolution images, diagrams, and schematics for clarity. Binding Type Binding: N/A (Digital Format) Paper Type Paper: N/A (Digital Format) ⚙️ Engine Specifications Primary Engine Engine Type: Naturally Aspirated Inline-6 (I6) Engine Code: M54B25 Displacement: 2.5 Liters (2494 cc) Bore X Stroke: 84 mm x 75 mm Compression Ratio: 10.2:1 Valve Train: DOHC, 24 Valves (4 per cylinder) with Double VANOS (Variable Valve Timing) Performance Horsepower: 184 hp @ 6000 rpm Torque: 175 lb-ft @ 3500 rpm Fuel System Fuel Delivery: Sequential Multi-Port Fuel Injection (MPI) Fuel Type: Premium Unleaded Gasoline (91+ Octane Recommended) Emissions Control: Dual Catalytic Converters, Oxygen Sensors (O2 Sensors), Secondary Air Injection System (SAI) on some models. 🔧 Transmission Standard Type: 5-Speed Manual (Getrag GS5-39DZ) Optional Type: 5-Speed Steptronic Automatic (GM A5S360R) Features Manual Clutch: Hydraulically Actuated Single Dry Plate Clutch Automatic Modes: Sequential Shift Mode (Steptronic) Fluid Specs Manual Fluid Type: BMW MTF LT-2 or equivalent (e.g., Pentosin MTF2) Automatic Fluid Type: Esso LT 71141 or equivalent (e.g., Pentosin ATF1) 📐 Dimensions Exterior Length: 177.4 inches (4506 mm) Width: 68.7 inches (1745 mm) Height: 56.1 inches (1425 mm) Wheelbase: 107.4 inches (2728 mm) Interior Seating Capacity: 5 Weights Curb Weight Manual: 3397 lbs (1541 kg) Curb Weight Automatic: 3472 lbs (1575 kg) 🛡️ Safety Features Ratings NHTSA Front Impact: 5-Star Driver, 4-Star Passenger IIHS Side Impact: Good Active Features Traction Control: Automatic Stability Control (ASC) or Dynamic Stability Control (DSC) Braking Assist: Anti-lock Braking System (ABS) Passive Features Airbags: Frontal Driver and Passenger Airbags, Optional Side-Impact Airbags Seatbelts: 3-point inertia-reel seat belts with front force limiters and pretensioners 💡 Technology Features Infotainment Head Unit Options: BMW Professional Radio, optional Navigation System (MK III/MK IV based) with CD or DVD. Audio System: Standard 6-speaker system, optional Harman Kardon or Hi-Fi sound systems. Driver Assistance Stability Control: Dynamic Stability Control (DSC) is standard on most models. Parking Assist: Optional Rear Park Distance Control (PDC). Connectivity Connectivity Features: Optional Bluetooth hands-free interface (via TCU unit), optional CD changer. 🔧 Maintenance Service Intervals Oil Change Interval: BMW Condition Based Service (CBS) system recommends based on driving conditions; typically around 7,500-15,000 miles or 12-24 months. Spark Plug Replacement: Typically every 60,000 miles (100,000 km) for platinum or iridium plugs. Coolant Flush: Every 2-4 years or as per CBS. Fluid Specifications Engine Oil Type: SAE 5W-30 or 5W-40 Synthetic, meeting BMW LL-01 specification. Engine Oil Capacity: Approx. 6.5 US quarts (6.2 Liters) with filter change. Coolant Type: BMW Blue Antifreeze/Coolant (G48 ethylene glycol based) or equivalent. Brake Fluid Type: DOT 4 Low Viscosity (LV) Brake Fluid. Known Issues Cooling System Common: Plastic expansion tank cracking, water pump failure (especially plastic impeller), coolant hoses degradation. Oil Leaks Common: Valve cover gasket, oil pan gasket, oil filter housing gasket (o-rings). Suspension Common: Front control arm bushings, rear subframe bushings, strut mounts. Electrical Common: CCFL Angel Eye rings (if equipped), Vanos solenoids, LCM (Light Control Module) issues, ABS/DSC sensor failures. Engine...