🏷️ Basic Information

Make:

Subaru

Model:

Impreza

Generations Covered:

Second Generation (GD/GG)

Model Years Covered:

2001, 2002, 2003, 2004, 2005, 2006, 2007

Chassis Codes:

GD (Sedan), GG (Wagon)

👋 Introduction

Segment:

Compact Car / Rally-inspired Compact

Target Audience:

Enthusiasts, DIY mechanics, performance drivers, owners seeking detailed repair information.

Key Competitors:

Mitsubishi Lancer, Honda Civic Si, Mazda3, Ford Focus.

Distinguishing Features:

Standard Symmetrical All-Wheel Drive (AWD) on most trims, rally heritage, turbocharged WRX/STI variants.

Vehicle Strengths:

Durable AWD system, responsive handling, peppy engines (especially turbo variants), practical hatchback option.

Manual Value Proposition:

Empowers owners to perform detailed maintenance and repairs, saving on labor costs and enhancing vehicle longevity. Crucial for diagnosing and fixing performance-related issues.

📋 Manual Details

Primary Coverage:

Repair and Service

Regional Applicability:

North America (implicitly, common for service manuals of this era)

Estimated Page Count:

1500+

Manual Type:

Factory Service Manual (FSM)

Language:

English

Format:

PDF Download

📖 Manual Coverage

Engine Mechanical:

Detailed disassembly, assembly, inspection, and repair of all engine components, including short block, long block, cylinder heads, camshafts, crankshaft, pistons, connecting rods, valves, timing belt/chain, oil pump, oil pan, etc.

Engine Management:

Fuel injection system, ignition system, emission control systems (catalytic converter, EGR, EVAP), engine control module (ECM) diagnosis, sensor testing, actuator operation.

Transmission Manual:

Disassembly, assembly, inspection, and repair of manual transmissions, clutch system, flywheel, shift linkages, and related components.

Transmission Automatic:

Diagnosis and repair of automatic transmissions, torque converter, valve body, transmission control module (TCM), fluid cooler, and shift solenoids.

Drivetrain:

Front and rear differentials, driveshafts, CV joints, propeller shaft (AWD models), wheel bearings, and hubs.

Suspension:

Front and rear suspension components, struts, shock absorbers, control arms, ball joints, bushings, stabilizer bars, and alignment procedures.

Brakes:

Front and rear brake systems (disc brakes), ABS (Anti-lock Braking System) diagnosis and repair, brake calipers, rotors, pads, brake lines, master cylinder, and brake fluid specifications.

Steering:

Power steering system, steering rack, tie rods, steering column, and wheel alignment specifications.

Electrical System:

Battery, charging system (alternator), starting system (starter), lighting (headlights, taillights, interior), fuses, relays, wiring diagrams, and component testing.

HVAC:

Heating, Ventilation, and Air Conditioning system diagnosis, components (compressor, condenser, evaporator, blower motor), refrigerant handling, and climate control modules.

Body And Interior:

Body panel removal and installation, door mechanisms, glass replacement, seat removal, dashboard disassembly, trim components, and interior materials.

Safety Systems:

Airbag system diagnosis and repair, seatbelt mechanisms, and related safety components.

Routine Maintenance:

Oil changes, filter replacements, coolant flushes, brake fluid changes, spark plug replacement, air filter replacement, and tire rotation.

Troubleshooting:

Systematic diagnostic procedures for common and complex issues, including DTC (Diagnostic Trouble Code) interpretation and guidance.

Major Repairs:

Engine overhaul, transmission rebuilds, differential repair, suspension component replacement, brake system overhauls, and electrical system repairs.

Component Replacement:

Step-by-step instructions for replacing individual parts like alternators, starters, water pumps, fuel pumps, sensors, injectors, radiators, and more.

Diagnostics:

Detailed guidance on using diagnostic tools, interpreting scan tool data, and performing electrical circuit tests.

Depth Of Information:

Comprehensive, from basic maintenance to full engine and transmission rebuilds.

Diagnostic Capabilities:

Advanced diagnostic procedures, including waveform analysis for critical sensors and actuators.

Technical Specifications:

Detailed torque specifications, clearances, fluid capacities, electrical resistance values, and pressure readings.

Wiring Diagrams:

Complete and detailed electrical wiring diagrams for all vehicle systems, aiding in troubleshooting electrical faults.

Schematics:

Vacuum diagrams, cooling system schematics, and HVAC system schematics.

📊 Manual Specifications

File Type:

PDF

Searchability:

Text-searchable (OCR'd) for quick information retrieval.

Image Resolution:

High-resolution images and diagrams suitable for printing.

Binding Type:

N/A (Digital Download)

Paper Type:

N/A (Digital Download)

⚙️ Engine Specifications

Engine Codes:

EJ251 (2.5L Naturally Aspirated), EJ205 (2.0L Turbocharged - WRX), EJ255 (2.5L Turbocharged - later WRX), EJ257 (2.5L Turbocharged - STI)

Displacement Na:

2.5 Liters (2457cc)

Displacement Turbo:

2.0 Liters (1994cc) / 2.5 Liters (2457cc)

Horsepower Na Approx:

165-175 hp

Torque Na Approx:

166-170 lb-ft

Horsepower Wrx Approx:

227-265 hp

Torque Wrx Approx:

247-290 lb-ft

Horsepower Sti Approx:

300 hp

Torque Sti Approx:

300 lb-ft

Fuel Delivery:

Multi-point Fuel Injection (MPI)

Fuel Type:

Unleaded gasoline (Premium recommended for Turbo models)

🔧 Transmission

Transmission Type Standard:

5-speed Manual (most trims)

Transmission Type Optional:

4-speed Automatic (common on NA models)

AWD System:

Symmetrical All-Wheel Drive (standard on most trims, variations between manual and automatic)

Differentials:

Center differential (open or viscous coupling depending on transmission/trim), front and rear differentials.

📐 Dimensions

Length Sedan:

Approx. 177.0 - 178.7 inches

Length Wagon:

Approx. 175.0 - 176.5 inches

Width:

Approx. 68.3 - 69.7 inches

Height:

Approx. 55.7 - 56.7 inches (Sedan), 57.1 - 58.5 inches (Wagon)

Wheelbase:

Approx. 104.0 inches

Curb Weight Approx Na:

2900 - 3200 lbs

Curb Weight Approx Wrx:

3100 - 3300 lbs

Curb Weight Approx Sti:

3250 - 3400 lbs

Wheel Bolt Pattern:

5x100mm

Recommended Tire Sizes:

205/50R16, 215/45R17, 225/45R17 (check specific trim/model)

🛡️ Safety Features

NHTSA Front Impact Driver:

Good (for models equipped with side airbags and curtain airbags)

NHTSA Front Impact Passenger:

Good (for models equipped with side airbags and curtain airbags)

IIHS Frontal Offset:

Acceptable (early models), Good (later models with improvements)

ABS:

Standard on most trims (4-wheel disc brakes with ABS)

Traction Control:

Optional/Standard on some higher trims (VDC - Vehicle Dynamics Control)

Airbags:

Front airbags (driver and passenger), optional side airbags and side curtain airbags (depending on trim/year).

Seatbelts:

3-point height-adjustable front seatbelts with pretensioners, rear 3-point seatbelts.

💡 Technology Features

Audio System:

Factory CD/Cassette or CD player with AM/FM radio, optional premium audio systems (e.g., with amplifier and subwoofer on higher trims).

User Interface:

Basic dashboard-mounted controls, simple display screens.

Cruise Control:

Standard on most trims.

ABS:

Integral to braking system performance.

Vdc:

Vehicle Dynamics Control (Traction and Stability Control) available on select higher trims and WRX/STI models.

Auxiliary Input:

Rarely standard; often requires aftermarket modification.

Bluetooth:

Not available from factory; requires aftermarket installation.

🔧 Maintenance

Oil Change Interval:

Every 3,750 miles or 6 months (severe driving conditions) / 7,500 miles or 12 months (normal driving conditions - check manual for exact recommendation).

Engine Oil Type Na:

5W-30 (API SG or higher)

Engine Oil Type Turbo:

5W-30 or 10W-30 (API SJ or higher - synthetic recommended for performance)

Coolant Type:

Subaru Genuine Coolant or equivalent (typically silicate-free, ethylene glycol based).

Transmission Fluid Manual:

75W-90 (API GL-5) Gear Oil

Transmission Fluid Automatic:

Subaru Genuine ATF HP or Dexron III / Mercon (check manual for exact spec)

Differential Fluid:

75W-90 (API GL-5) Gear Oil (front and rear)

Timing Belt Replacement:

105,000 miles or 105 months (critical for EJ251/EJ253 Naturally Aspirated engines)

Head Gaskets:

While less prevalent than earlier EJ engines, some later EJ251/EJ253 models could experience coolant leaks due to head gasket failure. Turbo models generally more robust but require proper maintenance.

Clutch Wear:

Can be a wear item, especially with spirited driving or heavy use of AWD in low-traction environments.

Suspension Bushings:

Rubber bushings in control arms and sway bars can degrade over time, leading to clunks or poor handling.

Catalytic Converter:

Can become clogged or fail with age/mileage, affecting engine performance and emissions.

Turbocharger Failures:

On WRX/STI models, proper warm-up/cool-down procedures and regular oil changes are crucial to prevent turbo bearing failure. Wastegate actuator issues can also occur.

Brake Fluid Type:

DOT 3 or DOT 4 (check manual)

Power Steering Fluid:

Subaru Genuine Power Steering Fluid or ATF (check manual)

📚 Vehicle History

Subaru Legacy:

Subaru's motorsport heritage, particularly in WRC (World Rally Championship) with the Impreza WRX STI, significantly boosted the model's profile.

Second Generation:

Introduced for the 2002 model year, replacing the first generation (GC/GF). Characterized by a more rounded, 'bug-eye' style front end for 2002-2003, evolving to a revised 'grille-eye' or 'hawk-eye' front end for 2004-2005, and a further facelift for 2006-2007.

Wrx Sti Development:

The WRX and WRX STI models were key performance variants, featuring turbocharged engines, intercoolers, revised suspension, and advanced AWD systems, often with driver-adjustable differentials.

Manufacturing Locations:

Japan (Gunma Plant)

🏆 Awards & Recognition

Wrc Heritage:

Multiple World Rally Championship titles (Manufacturers' and Drivers') solidify the Impreza's performance credentials and desirability.

Car And Driver 10Best:

WRX models frequently appeared on Car and Driver's '10Best' lists, recognizing their performance value.

Reliability Ratings:

Generally considered reliable, especially the naturally aspirated models. Turbo models require diligent maintenance for optimal reliability.