🏷️ Basic Information

Make:

Subaru

Model:

Impreza

Year:

2002

Chassis Code:

GDA/GDB (WRX/STI), GD2/GD3/GD9 (NA)

Engine Codes:

EJ205 (2.0L Turbo WRX), EJ255 (2.5L Turbo WRX - some markets), EJ207 (2.0L Twin-Scroll Turbo STI), EJ251 (2.5L NA), EJ201 (2.0L NA)

👋 Introduction

Market Position:

The 2002 Subaru Impreza, part of the second generation (GD/GG), solidified Subaru's reputation for rally-bred performance and all-weather capability. It competed against models like the Mitsubishi Lancer Evolution, Volkswagen Golf GTI, and Honda Civic Si.

Competitive Analysis:

The Impreza's key differentiator was its standard Symmetrical All-Wheel Drive system, offering superior traction and handling. The WRX and STI variants, in particular, offered potent turbocharged performance, appealing to enthusiasts.

Key Features:

Standard Symmetrical AWD, Boxer engine layout, available turbocharged performance (WRX/STI), durable construction, rally heritage.

📋 Manual Details

Coverage Areas:

North America, Europe, General International Markets

Page Count:

~1500-2000 pages (estimated for comprehensive factory-level manual)

Manual Type:

Full Service and Repair Manual

Language:

English

Format:

Digital (PDF) / Printable

📖 Manual Coverage

Systems Covered:

Engine mechanical (including disassembly, inspection, reassembly), Engine control systems (ECU, sensors, actuators), Fuel system (injection, pump, lines), Ignition system, Exhaust system, Cooling system, Lubrication system, Drivetrain (manual and automatic transmissions, differentials, AWD system), Suspension (front and rear), Steering system, Brakes (hydraulic, ABS), Electrical system (wiring diagrams, components, troubleshooting), Body and chassis (panels, frame, glass), HVAC system, Interior trim, Safety systems (airbags, seatbelts)

Procedures Included:

Scheduled maintenance, Tune-up procedures, Engine rebuilding (short block, long block, cylinder head), Transmission overhaul, Differential service, Brake caliper and rotor replacement, Suspension component replacement (struts, ball joints, bushings), Steering rack service, Electrical diagnostics, Air conditioning system service, Body panel alignment and repair, OBD-II diagnostics and code clearing, Clutch replacement, Timing belt replacement, Turbocharger inspection and service (for turbo models)

Diagnostic Procedures:

Extensive diagnostic procedures for all engine control, ABS, and HVAC systems, including troubleshooting tables and flowcharts for common electrical and mechanical faults.

Technical Depth:

Factory-level detail, including torque specifications, clearance measurements, diagnostic flowcharts, wiring schematics, and component testing procedures. Suitable for professional technicians and advanced DIY mechanics.

📊 Manual Specifications

File Format:

Searchable PDF with hyperlinked sections for easy navigation.

Print Quality:

High-resolution scans with clear diagrams and legible text, suitable for printing individual sections or the entire manual.

Binding Type:

Digital download (no physical binding)

Paper Type:

N/A (Digital Format)

Content Organization:

Logically structured with chapters for each major system, detailed sub-sections for specific components, troubleshooting guides, and clear step-by-step repair instructions.

⚙️ Engine Specifications

Primary Engine:

EJ251 2.5-liter SOHC horizontally opposed 4-cylinder (Naturally Aspirated)

Hp Na:

165 hp @ 5600 rpm (EJ251)

Torque Na:

166 lb-ft @ 4000 rpm (EJ251)

Hp Turbo:

227 hp @ 5600 rpm (EJ205 WRX), 300 hp @ 6200 rpm (EJ207 STI - JDM)

Torque Turbo:

236 lb-ft @ 3500 rpm (EJ205 WRX), 271 lb-ft @ 4000 rpm (EJ207 STI - JDM)

Fuel System:

Multi-point fuel injection (MPI) for all models. Turbocharged models feature advanced fuel delivery systems for higher boost pressures.

Engine Management:

Subaru Select Monitor (SSM) for diagnostics, ECU-controlled ignition and fuel timing.

Timing Mechanism:

Timing belt driven. Critical replacement interval (typically 90,000-105,000 miles).

Bore Stroke Na:

99.5 mm x 79.0 mm (EJ251)

Bore Stroke Turbo:

92.0 mm x 75.0 mm (EJ205/EJ207)

Compression Ratio Na:

9.7:1 (EJ251)

Compression Ratio Turbo:

8.5:1 (EJ205), 8.0:1 (EJ207)

Engine Layout:

Horizontally Opposed (Boxer) 4-Cylinder

Valvetrain:

SOHC 16-valve (NA), DOHC 16-valve (Turbo)

Cooling System:

Pressurized liquid cooling system with radiator, fan, thermostat, and expansion tank.

Engine Oil Capacity:

Approx. 4.5 US quarts (4.3 liters) with filter change (EJ251), 4.8 US quarts (4.5 liters) with filter change (EJ205/EJ207)

🔧 Transmission

Standard Transmission:

5-speed manual transmission

Optional Transmission:

4-speed automatic transmission (available on most NA models, some markets)

AWD System:

Symmetrical All-Wheel Drive (standard on all models). Viscous coupling center differential (manual) or electronically controlled multi-plate transfer clutch (automatic).

Manual Transmission Fluid:

Subaru Extra LPS Fluid (GL-5, SAE 75W-90) or equivalent.

Automatic Transmission Fluid:

Subaru ATF-HP or equivalent.

Front Rear Differential Fluid:

Subaru Extra LPS Fluid (GL-5, SAE 75W-90) or equivalent.

📐 Dimensions

Length:

Approx. 4415 mm (173.8 in)

Width:

Approx. 1700 mm (66.9 in)

Height:

Approx. 1410 mm (55.5 in) (sedan) / 1440 mm (56.7 in) (wagon)

Curb Weight:

Approx. 1350-1450 kg (2976-3197 lbs) depending on trim and drivetrain

Gross Vehicle Weight Rating:

Varies by model, typically around 1900-2000 kg (4189-4409 lbs)

Wheelbase:

Approx. 2525 mm (99.4 in)

Wheelbase Subaru Impreza 2002:

2525 mm (99.4 in)

Front Rear Track Width:

Approx. 1465 mm (57.7 in) / 1460 mm (57.5 in)

Ground Clearance:

Approx. 140 mm (5.5 in)

Cargo Volume Sedan:

Approx. 11.6 cu ft (328 liters)

Cargo Volume Wagon:

Approx. 37.7 cu ft (1068 liters) with rear seats up

🛡️ Safety Features

NHTSA Front Impact:

4 stars (driver and passenger)

IIHS Side Impact:

Good (1999-2003 models)

Active Features:

Anti-lock Braking System (ABS) standard on most trims, Optional Electronic Brake-force Distribution (EBD) on some models.

Passive Features:

Front airbags (driver and passenger), Optional side airbags, Three-point seatbelts with pretensioners, Crumple zones, Side impact door beams.

Common Recalls:

Takata airbag inflator recall (affected models), potential for minor electrical issues.

💡 Technology Features

Infotainment System:

Basic factory radio with CD player, AM/FM tuner. Optional premium audio systems were available.

Driver Assistance Features:

Limited. Primarily ABS on most models. No advanced driver-assistance systems (ADAS) like adaptive cruise control or lane keeping assist were offered.

Connectivity:

No integrated Bluetooth or USB ports from the factory. Auxiliary input may be present on some aftermarket head units or later factory upgrades.

Instrumentation:

Analog gauges for speedometer, tachometer, fuel level, and engine temperature. Multi-function display for odometer, trip meters, and warning lights. WRX/STI models feature a prominent boost gauge.

🔧 Maintenance

Oil Change Interval:

Every 3,750 miles or 6 months, whichever comes first (severe duty) or 7,500 miles or 12 months (normal duty).

Timing Belt Replacement:

Recommended at 90,000-105,000 miles or 105 months, whichever comes first. Includes tensioner and idler pulleys.

Coolant Replacement:

First replacement at 30,000 miles or 36 months, then every 15,000 miles or 18 months thereafter.

Engine Oil Spec:

API SG or higher, SAE 5W-30 synthetic recommended. Check owner's manual for specific viscosity based on ambient temperature.

Brake Fluid Spec:

DOT 3 or DOT 4.

Power Steering Fluid Spec:

Subaru Genuine Power Steering Fluid or Dexron III/Mercon ATF.

Known Issues:

Head gasket leaks (particularly on EJ25 engines, though less prevalent than later generations), turbocharger failure (on WRX/STI due to high-performance use and oil starvation if not maintained), clutch wear (especially in manual transmission models), wheel bearing failure, and occasional electrical gremlins. Oil consumption can occur on higher mileage EJ engines.

Oil Filter Part Number:

Subaru OEM: 15208AA100 or equivalent aftermarket (e.g., Wix 57356, Purolator PL14610).

Air Filter Part Number:

Subaru OEM: 16546AA12A or equivalent aftermarket.

Maintenance Schedule Summary:

Includes recommended checks and replacements at intervals such as 7,500 miles (12,000 km), 15,000 miles (24,000 km), 30,000 miles (48,000 km), and major services at 90,000-105,000 miles (timing belt).

📚 Vehicle History

Brand Heritage:

Subaru, a division of Subaru Corporation, has a history of producing reliable vehicles with a focus on all-wheel-drive technology, stemming from their early aircraft manufacturing roots.

Model Evolution:

The 2002 Impreza marked the beginning of the second generation (GD/GG), featuring a significant redesign with a more rounded and aerodynamic body style. This generation introduced the iconic wide-body styling for WRX and STI models.

Production Years:

2002-2007 (Second Generation GD/GG)

Manufacturing Locations:

Japan (Gunma Plant), and various assembly plants globally.

🏆 Awards & Recognition

Recognitions:

The Subaru Impreza, particularly the WRX and STI variants, has received numerous accolades from automotive publications and enthusiasts for its performance, handling, and rally-inspired capabilities. Often cited as a benchmark for affordable performance AWD sedans.

Consumer Reports Reliability:

Variable. Early models had some reliability concerns, particularly with head gaskets, but the overall platform is considered robust with proper maintenance.