🏷️ Basic Information

Make:

Subaru

Model:

Impreza

Year:

2006

Body Style:

Sedan, Wagon

Chassis Code:

GDA (WRX Sedan), GDB (STI Sedan), GGA (WRX Wagon), GGB (STI Wagon)

Engine Codes:

EJ205 (2.0L Turbo), EJ255 (2.5L Turbo), EJ253 (2.5L Naturally Aspirated)

👋 Introduction

Vehicle Segment:

Compact car (C-segment)

Key Selling Points:

Symmetrical All-Wheel Drive (standard on most trims), turbocharged performance variants (WRX, STI), rally heritage, reliability.

Primary Competitors:

Honda Civic Si, Mitsubishi Lancer Evolution, Volkswagen GTI, Mazda3.

AWD System:

Standard Symmetrical All-Wheel Drive (except for specific US market base models in some years).

Performance Variants:

Subaru Impreza WRX and WRX STI offered with significant performance upgrades.

📋 Manual Details

Manual Type:

Full Service & Repair Manual

Language:

English

Format:

Digital (likely PDF)

Estimated Page Count:

1000+

📖 Manual Coverage

Engine Mechanical:

Complete overhaul, timing belt replacement, head gasket repair, piston and ring replacement, crankshaft and bearing service, cylinder head reconditioning.

Engine Electrical:

Ignition system diagnosis and repair, fuel injection system, sensor testing and replacement (MAF, O2, MAP, TPS, Crank/Cam sensors), starter and alternator testing, ECU/ECM diagnostics.

Fuel System:

Fuel pump testing, fuel injector cleaning and replacement, fuel pressure regulation, fuel filter replacement.

Cooling System:

Radiator service, water pump replacement, thermostat testing, coolant flushing and replacement, fan clutch/motor diagnosis.

Exhaust System:

Catalytic converter replacement, muffler and pipe repair/replacement, exhaust manifold gasket service.

Transmission Manual:

Clutch replacement, gearbox overhaul, gear selection linkage adjustment, transmission fluid service.

Transmission Automatic:

Automatic transmission fluid service, torque converter inspection, transmission control module (TCM) diagnostics, internal component repair (if covered).

Drivetrain AWD:

Center differential service, front and rear differential service, driveshaft and CV joint inspection/replacement, viscous coupling unit (VCU) service (if applicable).

Steering System:

Power steering pump and rack replacement, fluid flush, steering column repair, tie rod end and ball joint replacement.

Suspension System:

Strut and shock absorber replacement, coil spring replacement, control arm bushing service, sway bar link replacement, alignment specifications.

Brake System:

Brake pad and rotor replacement, caliper service, brake line replacement, master cylinder service, ABS system diagnostics, parking brake adjustment.

Electrical System Lighting:

Headlight, taillight, interior light bulb replacement, headlight aiming, fuse and relay identification and testing.

Electrical System Accessories:

Wiper system diagnosis and repair, power window and lock system troubleshooting, horn circuit, power outlet service.

Body And Frame:

Door panel removal, bumper cover replacement, body panel alignment, rust repair procedures, chassis lubrication points.

Climate Control:

HVAC system diagnosis, refrigerant recharge, blower motor replacement, heater core and evaporator core service, cabin air filter replacement.

Safety Systems:

Airbag system diagnosis, seat belt repair, SRS module troubleshooting.

Diagnostics:

OBD-II diagnostic trouble code (DTC) lookup, common fault diagnosis for various systems, troubleshooting flowcharts.

Maintenance:

Oil and filter change, air filter replacement, spark plug replacement, coolant flush, brake fluid flush, differential fluid change, fuel filter replacement.

Repair:

Component replacement, system diagnostics and repair, reassembly of major sub-assemblies.

Rebuild:

Detailed procedures for engine and transmission rebuilding, including torque specifications and clearances.

Troubleshooting:

Step-by-step guides for diagnosing and resolving common and uncommon vehicle issues.

Wiring Diagrams:

Comprehensive electrical wiring diagrams for all vehicle systems.

Depth Level:

Comprehensive (from basic maintenance to full rebuilds)

Diagnostic Tools:

Information on required diagnostic tools and procedures (e.g., OBD-II scanner, multimeter).

📊 Manual Specifications

Digital Format:

PDF

Searchability:

Text-searchable (if well-formatted PDF)

Illustration Quality:

High-resolution diagrams and photos (typical for good digital manuals)

Binding Style:

N/A (Digital Format)

Paper Quality:

N/A (Digital Format)

⚙️ Engine Specifications

Base Engine:

2.5L Naturally Aspirated Boxer-4 (EJ253)

Base Engine Power:

Approx. 173 hp @ 5,600 rpm

Base Engine Torque:

Approx. 166 lb-ft @ 4,000 rpm

Wrx Engine:

2.5L Turbocharged Boxer-4 (EJ255)

Wrx Engine Power:

Approx. 230 hp @ 5,200 rpm

Wrx Engine Torque:

Approx. 235 lb-ft @ 3,000 rpm

Sti Engine:

2.5L Turbocharged Boxer-4 (EJ257)

Sti Engine Power:

Approx. 300 hp @ 6,000 rpm

Sti Engine Torque:

Approx. 300 lb-ft @ 4,000 rpm

Fuel Delivery:

Electronic Fuel Injection (EFI)

Fuel Type:

Unleaded gasoline (premium recommended for turbo models)

Engine Layout:

Horizontally opposed (Boxer), DOHC, 16 valves

🔧 Transmission

Base Transmission:

5-speed Manual Transmission

Optional Transmission:

4-speed Automatic Transmission (with Sportshift on some trims)

AWD System Transmission Link:

All-wheel drive system integrated with transmission (e.g., DCCD on STI).

Manual Transmission Fluid:

API GL-5, SAE 75W-90 (check specific subaru specs for most accurate, e.g., Subaru Extra-S)

Automatic Transmission Fluid:

Subaru ATF-HP (check specific manual for correct type)

📐 Dimensions

Wheelbase:

Approx. 103.1 inches (2,619 mm)

Length:

Sedan: Approx. 179.7 inches (4,565 mm); Wagon: Approx. 177.7 inches (4,515 mm)

Width:

Approx. 69.9 inches (1,775 mm)

Height:

Sedan: Approx. 57.7 inches (1,465 mm); Wagon: Approx. 56.1 inches (1,425 mm)

Curb Weight:

Approx. 3,000 - 3,400 lbs (1,360 - 1,540 kg), varies by trim and body style

Gross Vehicle Weight Rating:

Varies by model, check VIN plate

Towing Capacity:

Not typically recommended or specified for this model.

🛡️ Safety Features

NHTSA Front Impact Driver:

5 Stars (for applicable models)

NHTSA Front Impact Passenger:

5 Stars (for applicable models)

IIHS Moderate Overlap Front:

Good (for applicable models)

ABS:

Standard Anti-lock Braking System (ABS)

Traction Control:

Standard Traction Control System (TCS)

Electronic Stability Control:

Available Electronic Stability Control (ESC) / Vehicle Dynamics Control (VDC)

Airbags:

Frontal airbags, front side-impact airbags, available curtain airbags.

Seatbelts:

3-point seatbelts with pretensioners and load limiters.

💡 Technology Features

Head Unit:

Factory AM/FM/CD player, optional satellite radio and premium audio systems.

Display Screen:

Basic LCD display for radio information, clock, and climate control. No integrated navigation in most trims.

Cruise Control:

Standard cruise control on most trims.

All Wheel Drive:

The core technological feature, providing enhanced traction and stability.

Auxiliary Input:

Auxiliary audio input jack available on some models.

Bluetooth:

Not standard; aftermarket integration is common.

🔧 Maintenance

Oil Change Interval:

Every 3,750 miles (6,000 km) or 6 months, whichever comes first (or 7,500 miles/12 months with synthetic oil - check manual for specifics).

Timing Belt Replacement:

105,000 miles (168,000 km) or 7 years, whichever comes first (critical for interference engines).

Spark Plug Replacement:

Approx. 60,000 - 100,000 miles depending on plug type (iridium plugs recommended for longevity).

Coolant Flush Interval:

Every 30,000 miles or 2 years.

Engine Oil Type:

SAE 5W-30 (API SG or higher), synthetic recommended.

Engine Oil Capacity:

Approx. 4.8 quarts (4.5 liters) with filter change (for 2.5L).

Coolant Type:

Subaru Super Coolant (Blue) or equivalent phosphate-free OAT coolant.

Brake Fluid Type:

DOT 3 or DOT 4.

Head Gaskets:

While less common on EJ253 compared to earlier EJ25s, EJ255/EJ257 engines can be susceptible to blown head gaskets under high stress or if modified without proper cooling/tuning.

Ring Land Failure:

Potential issue on EJ255/EJ257 engines with aggressive tuning or detonation, leading to piston ring land damage.

Clutch Wear:

Especially on WRX/STI models due to performance driving, clutch wear can be accelerated.

Rear Differential Mounts:

Can wear and cause clunking noises under acceleration/deceleration.

📚 Vehicle History

Subaru Rally Heritage:

Subaru's strong connection to the World Rally Championship (WRC) heavily influenced the Impreza WRX and STI models.

Generation:

Second Generation (GD/GG chassis)

Facelift:

This generation received a significant facelift for the 2004 model year, introducing the 'bug-eye' headlights to a more conventional design.

Production Period:

2002-2007 (for GD/GG chassis)

Manufacturing Location:

Japan

🏆 Awards & Recognition

Car And Driver 10Best:

Subaru Impreza WRX and STI have historically been frequent recipients of Car and Driver's 10Best list, particularly the WRX STI variants.

Consumer Reports Reliability:

Varies by year and model, but generally considered average to above average, with specific model years and engines having better documented reliability.

Jd Power Dependability:

Subject to specific year ratings, but Subaru as a brand often scores well in initial quality and dependability studies.