The 2003 Buick Century is a comfortable and practical mid-size sedan, built on the reliable GM W-body platform. Known for its spacious interior and smooth ride, this model offered a compelling balance of features and value, making it a popular choice for everyday transportation. It competed effectively within its segment, providing dependable V6 engine options that ensured a pleasant driving experience for a wide range of owners. Buick's legacy of producing quality American sedans is evident in the Century's design and engineering. This comprehensive service and repair manual provides detailed guidance for maintaining and repairing your 2003 Buick Century. It covers all essential systems, including the engine, drivetrain, brakes, steering, suspension, and electrical components. You will find step-by-step instructions for routine maintenance, troubleshooting common issues, and performing complex repairs. The manual also includes essential technical specifications, diagnostic procedures, and safety guidelines, empowering owners and technicians to keep the vehicle in optimal condition. 🏷️ Basic Information Identification Make: Buick Model: Century Year: 2003 Codes Platform: GM W-body 👋 Introduction Market Position Positioning: The 2003 Buick Century was positioned as a comfortable, practical, and value-oriented mid-size sedan, appealing to a broad demographic seeking reliable transportation. Competitive Analysis Competitors: Competed against vehicles like the Ford Taurus, Chevrolet Impala, Dodge Intrepid, and Toyota Camry in the mid-size sedan segment. Key Features Highlights: Known for its comfortable ride, spacious interior, and dependable V6 engine options. Offered a good balance of features for its price point. 📋 Manual Details Coverage Areas Manual Type: Official Service and Repair Manual Software Language: English Format: PDF Download (via web browser access) Access Duration: 1 Year (with renewal options) 📖 Manual Coverage Systems Covered Engine: Complete service, diagnostics, and repair for all 2003 Century engine variants. Drivetrain: Detailed procedures for automatic transmission service, overhaul, and diagnosis; drive axle and CV joint service. Brakes: Comprehensive coverage of hydraulic systems, ABS, brake pad/rotor replacement, caliper service, and parking brake adjustments. Steering: Power steering system service, diagnosis, and component replacement (pump, rack and pinion). Suspension: Front and rear suspension component service (shocks, struts, control arms, ball joints, sway bar links), alignment specifications. Electrical: Full wiring diagrams, diagnostic procedures for all electrical systems, battery, charging system, starting system, lighting, and accessories. HVAC: Air conditioning system service, refrigerant handling, heater core replacement, climate control system diagnosis. Body: Body panel repair, interior trim removal and installation, glass replacement, door and lock mechanisms. Procedures Included Maintenance: Oil changes, filter replacements, fluid level checks and top-offs, tire rotations, spark plug replacement, belt inspection and replacement. Troubleshooting: Diagnostic flowcharts and symptom-based troubleshooting guides for common and complex issues. Repair: Step-by-step instructions for component replacement, rebuilds, and system repairs. Diagnostics: OBD-II diagnostic trouble code (DTC) interpretation and diagnostic procedures. Technical Depth Depth: Comprehensive coverage from basic preventative maintenance to advanced engine and transmission overhauls, including detailed diagnostic procedures. 📊 Manual Specifications File Format Format: PDF Download Searchability: Text-searchable PDF for quick information retrieval. Print Quality: High-resolution, printable pages. Binding Type Binding: N/A (Digital Download) Paper Type Paper: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Code 1: 3.1L V6 (L82/LG8) Displacement 1: 3.1 Liters (189 cubic inches) Horsepower 1: 150 hp @ 5200 rpm (approx.) Torque 1: 185 lb-ft @ 4000 rpm (approx.) Alternative Engine Engine Code 2: 2.2L Inline-4 (L43) Displacement 2: 2.2 Liters (134 cubic inches) Horsepower 2: 115 hp @ 5200 rpm (approx.) Torque 2: 135 lb-ft @ 3800 rpm (approx.) Fuel System Fuel Delivery: Multi-port Fuel Injection (MPFI) Engine Management ECU Type: GM Gen III Powertrain Control Module (PCM) 🔧 Transmission Standard Type 1: 4-speed Automatic Transaxle Transmission Model 1: GM 4T65-E Optional Type 2: N/A (2003 model year was exclusively automatic) Features Features: Lock-up torque converter for improved fuel economy at highway speeds. 📐 Dimensions Exterior Length: 193.3 inches Width: 70.4 inches Height: 55.9 inches Wheelbase: 109.0 inches Interior Passenger Volume: 98.0 cubic feet (approx.) Cargo Trunk Volume: 16.7 cubic feet (approx.) Weights Curb Weight Min: 3300 lbs (approx. for 4-cyl models) Curb Weight Max: 3500 lbs (approx. for V6 models) 🛡️ Safety Features Ratings NHTSA Driver Frontal Crash Rating: Good (2003 model year testing) NHTSA Passenger Frontal Crash Rating: Good (2003 model year testing) Active Features ABS: Standard Anti-lock Braking System (ABS) Traction Control: Optional Traction Control System (TCS) on some models. Passive Features Airbags Front: Driver and front passenger airbags Airbags Side: Optional front side-impact airbags. 💡 Technology Features Infotainment Audio System: Standard AM/FM stereo with CD player or cassette. Optional premium sound systems available. Climate Control: Manual climate control standard; optional automatic climate control on higher trims. Driver Assistance Cruise Control: Standard cruise control. Connectivity Onstar: Optional OnStar in-vehicle safety and communication system available. 🔧 Maintenance Service Intervals Oil Change Interval: Every 5,000 - 7,500 miles or 6 months, whichever comes first (depending on oil type and driving conditions). Transmission Fluid...