Segment:
Compact/Sport Compact
Positioning:
Known for its all-wheel-drive capability, rally heritage, and sporty handling, particularly in WRX and STI trims
Key Competitors:
Mitsubishi Lancer Evolution, Volkswagen GTI, Mazda3, Honda Civic Si
Drivetrain:
Standard Symmetrical All-Wheel Drive (AWD) across all trims
Performance Variants:
WRX offers turbocharged performance; STI offers higher performance with more advanced AWD and engine tuning
Platform:
Based on Subaru's global platform, known for its boxer engine placement and AWD system integration
Engine:
Engine mechanical, lubrication, cooling, fuel, ignition, emissions, engine control system (ECU), forced induction (turbocharging for WRX/STI)
Transmission:
Manual transmission (5-speed, 6-speed for STI), automatic transmission (4-speed), clutch system, drive shafts, differentials (front, rear, center viscous coupling/DCCD for STI)
Brakes:
Brake system, hydraulic components, ABS, parking brake, brake disc and pad replacement, bleeding procedure
Suspension Steering:
Front and rear suspension (struts, springs, control arms, stabilizer bars), steering system (rack and pinion, power steering), wheel alignment specifications
Electrical:
Wiring diagrams, battery, charging system, starting system, lighting, instrument cluster, body electrical, infotainment, power accessories
Body Chassis:
Body exterior (panels, doors, hood, trunk), interior trim, structural components, glass, body sealing
Heating Air Conditioning:
HVAC system, refrigerant handling, component diagnosis and replacement
Maintenance:
Scheduled maintenance, oil changes, filter replacements, fluid checks and changes, spark plug replacement, belt inspection and replacement
Repair:
Engine rebuilds, transmission overhaul, brake caliper replacement, suspension component repair, electrical component troubleshooting and replacement
Diagnostics:
Troubleshooting guides, fault code interpretation (OBD-II), diagnostic procedures for various systems
Specifications:
Torque specifications for all fasteners, fluid capacities and types, engine data, dimension data
Depth Level:
Factory-level detail, suitable for professional technicians and advanced DIYers
Diagnostic Tools:
References diagnostic procedures often requiring Subaru Select Monitor (SSM) or compatible OBD-II scan tools
File Type:
PDF (common for digital downloads of factory manuals)
Searchability:
Likely text-searchable if a well-scanned PDF
Printability:
Printable pages for workshop use
Image Resolution:
Variable, dependent on source scan quality, typically high for factory manuals
Binding:
Not applicable for digital format
Paper:
Not applicable for digital format
Engine Code 2.5I:
EJ253 (2.5L SOHC Naturally Aspirated)
Engine Code Wrx:
EJ255 (2.5L DOHC Turbocharged)
Engine Code Sti:
EJ257 (2.5L DOHC Turbocharged, intercooled)
Horsepower 2.5I:
173 hp @ 5600 rpm
Torque 2.5I:
166 lb-ft @ 4000 rpm
Horsepower Wrx:
230 hp @ 5600 rpm
Torque Wrx:
235 lb-ft @ 3600 rpm
Horsepower Sti:
305 hp @ 6000 rpm
Torque Sti:
290 lb-ft @ 4000 rpm
Fuel Type:
Unleaded gasoline (87 octane recommended for 2.5i, 91+ octane for WRX/STI)
Fuel Delivery:
Multi-point fuel injection (MPI)
Forced Induction:
Twin-scroll turbocharger with intercooler (WRX/STI)
2.5I Transmission:
5-speed manual transmission
Wrx Transmission:
5-speed manual transmission
Sti Transmission:
6-speed manual transmission
2.5I Optional Transmission:
4-speed automatic transmission
AWD System:
Symmetrical All-Wheel Drive with mechanical center differential (5-speed manual), viscous center coupling (4-speed auto, 5-speed WRX manual), or Driver Controlled Center Differential (DCCD) (STI 6-speed manual)
Manual Transmission Fluid Type:
API GL-5 SAE 75W-90 (refer to specific subaru fluid part numbers for accuracy)
Automatic Transmission Fluid Type:
Subaru ATF-HP (or equivalent)
NHTSA Front Impact:
5 Stars (2006 models)
NHTSA Side Impact Front:
5 Stars (2006 models)
NHTSA Side Impact Rear:
4 Stars (2006 models)
IIHS Moderate Overlap Frontal Offset:
Good (2006 models)
ABS:
Standard Anti-lock Braking System
Traction Control:
Available (standard on some models/trims)
Electronic Stability Control:
Standard (Subaru VDC - Vehicle Dynamics Control)
Airbags:
Front dual-stage airbags, front side-impact airbags, front and rear side-curtain airbags (optional/standard depending on trim)
Audio System:
Standard AM/FM/CD audio system, optional premium audio with subwoofer. Bluetooth connectivity often aftermarket or limited on base models.
Navigation:
Optional factory navigation system available on some higher trims.
Cruise Control:
Standard cruise control
Keyless Entry:
Available keyless entry and remote start
Usb Aux Input:
Often lacking on factory systems, commonly added via aftermarket.
Oil Change Interval:
Every 3,750 miles or 3 months (severe conditions), or 7,500 miles or 6 months (normal conditions). Consult manual for exact Subaru recommendations and oil type.
Engine Air Filter:
Inspect every 7,500 miles, replace as needed. Replace at 30,000 miles per some recommendations.
Cabin Air Filter:
Replace every 15,000 miles or 12 months.
Spark Plugs:
Iridium type, replace every 105,000 miles.
Engine Oil Capacity:
4.8 US quarts (with filter) for 2.5L Naturally Aspirated, 5.0 US quarts (with filter) for 2.5L Turbocharged. Consult manual for exact fill.
Engine Oil Type:
SAE 5W-30 API SM or ILSAC GF-4 certified (check manual for specific viscosity and certification)
Coolant Type:
Subaru Super Coolant (Blue) or equivalent P-HOAT type coolant
Brake Fluid Type:
SAE J1703 or FMVSS No. 116 DOT 3
Ej25 Head Gaskets:
While less prevalent than in earlier EJ series engines, head gasket leaks can still occur. Early detection and proper torque are critical.
Turbo Failure Wrx Sti:
Improper break-in of new turbochargers, lack of oil changes, or oil contamination can lead to turbo failure. Cool down periods for turbo vehicles are essential.
Clutch Wear:
Can be accelerated by aggressive driving, especially in WRX and STI models.
Catastrophic Engine Failure:
For tuned or heavily modified WRX/STI models, improper tuning or component failure can lead to catastrophic engine damage.
Brand Focus:
Subaru is renowned for its engineering prowess, particularly its horizontally opposed boxer engines and standard Symmetrical All-Wheel Drive systems, originating from its aerospace division.
Impreza Generations:
The 2006-2007 models represent the second generation (GD/GG) Impreza, a significant update from the first generation, featuring revised styling and improved dynamics.
Rally Heritage:
The Impreza, especially the WRX and STI variants, has a strong lineage in global rally championships (WRC), influencing its performance-oriented design and tuning.
Manufacturing Location:
Japan
