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.
Competitors:
Competed against vehicles like the Ford Taurus, Chevrolet Impala, Dodge Intrepid, and Toyota Camry in the mid-size sedan segment.
Highlights:
Known for its comfortable ride, spacious interior, and dependable V6 engine options. Offered a good balance of features for its price point.
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.
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.
Depth:
Comprehensive coverage from basic preventative maintenance to advanced engine and transmission overhauls, including detailed diagnostic procedures.
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.)
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 Delivery:
Multi-port Fuel Injection (MPFI)
ECU Type:
GM Gen III Powertrain Control Module (PCM)
NHTSA Driver Frontal Crash Rating:
Good (2003 model year testing)
NHTSA Passenger Frontal Crash Rating:
Good (2003 model year testing)
ABS:
Standard Anti-lock Braking System (ABS)
Traction Control:
Optional Traction Control System (TCS) on some models.
Airbags Front:
Driver and front passenger airbags
Airbags Side:
Optional front side-impact airbags.
Oil Change Interval:
Every 5,000 - 7,500 miles or 6 months, whichever comes first (depending on oil type and driving conditions).
Transmission Fluid Change:
Recommended every 60,000 - 100,000 miles, or as per severe service schedule.
Spark Plug Replacement 3.1L:
Platinum-tipped plugs typically rated for 100,000 miles. Refer to manual for specific type.
Engine Oil Type:
SAE 5W-30 (API certified)
Engine Oil Capacity 3.1L:
4.5 US quarts (4.3 Liters) with filter change.
Transmission Fluid Type:
Dexron-III H Automatic Transmission Fluid (ATF)
Coolant Type:
GM Universal Orange Coolant (or equivalent silicate-free, long-life coolant)
Common Issues List:
Intake manifold gasket leaks (3.1L V6), power steering pump leaks, occasional issues with window regulators and door locks, and potential for catalytic converter failure.
Brand Legacy:
Buick has a long history of producing comfortable and reliable American sedans, often associated with a premium feel and smooth ride.
Generation:
This 2003 model represents the third generation of the Buick Century (introduced in 1997), based on the GM W-body platform shared with vehicles like the Chevrolet Impala and Pontiac Grand Prix.
Production Years:
1997-2005
Manufacturing Location:
United States (Various GM assembly plants)
