🏷️ Basic Information

Make:

Subaru

Model:

Impreza WRX STI

Year:

2012

Chassis Code:

GVB/GRB

Engine Code:

EJ257

👋 Introduction

Positioning:

Performance sedan positioned as a rally-bred, all-wheel-drive icon.

Competitors:

Mitsubishi Lancer Evolution, Volkswagen Golf GTI, Ford Focus RS.

Drivetrain:

Symmetrical All-Wheel Drive (SAWD), Driver Controlled Center Differential (DCCD).

Engine:

2.5L turbocharged Boxer engine.

Suspension:

Performance-tuned suspension with inverted front struts.

Styling:

Aggressive styling with large rear wing, hood scoop, and fender flares.

📋 Manual Details

Coverage Scope:

Complete service and repair for all systems and components.

Estimated Pages:

2500+

Type:

Factory Service Manual / Repair Manual

Language:

English

Format:

PDF Download

📖 Manual Coverage

Engine:

Engine mechanical, lubrication, cooling, fuel, ignition, exhaust, emissions, engine control.

Transmission:

Manual transmission (TY75) service, clutch, driveline, differentials.

Brakes:

Brake system hydraulics, ABS, EBD, parking brake.

Steering:

Power steering system, steering column, steering gear.

Suspension:

Front and rear suspension, struts, springs, bushings, alignment specifications.

Electrical:

Battery, charging system, starting system, lighting, instrumentation, body electrical, power accessories, wiring diagrams.

HVAC:

Heating, ventilation, and air conditioning system diagnostics and repair.

Body:

Body panels, doors, glass, interior trim, exterior trim, chassis frame.

ECM Diagnostics:

Powertrain Control Module (PCM) diagnostics, DTCs (Diagnostic Trouble Codes).

Maintenance:

Scheduled maintenance, oil changes, filter replacements, fluid checks, spark plug replacement.

Troubleshooting:

Diagnostic flowcharts, symptom-based troubleshooting, common problems and solutions.

Repair:

Component removal and installation, assembly and disassembly procedures.

Engine Rebuild:

Complete engine overhaul, internal component specifications, torque values.

Transmission Rebuild:

Manual transmission disassembly, inspection, repair, and reassembly.

Diagnostics:

OBD-II diagnostics, sensor testing, actuator testing.

Alignment:

Wheel alignment angles and specifications.

Electrical Repair:

Component testing, wiring harness repair, connector diagnosis.

Suspension Repair:

Strut replacement, bushing replacement, control arm service.

Brake Service:

Brake pad replacement, rotor replacement, brake bleeding.

Depth:

Comprehensive, suitable for professional technicians, covers basic to advanced repairs and diagnostics.

📊 Manual Specifications

Searchability:

Fully searchable text content.

Printability:

Printable pages.

Resolution:

High-resolution images and diagrams.

Binding:

N/A (Digital Download)

Paper Type:

N/A (Digital Download)

⚙️ Engine Specifications

Type:

2.5L DOHC 16-valve turbocharged Boxer Engine

Code:

EJ257

Horsepower:

305 hp @ 6000 rpm

Torque:

290 lb-ft @ 4000 rpm

Redline:

7000 rpm

Induction:

Turbocharged, Intercooled, Sequential Multi-Point Fuel Injection

Fuel Type:

Premium Unleaded Gasoline (91 Octane or higher recommended)

ECU:

Subaru Engine Control Module (ECM)

🔧 Transmission

Type:

6-Speed Manual Transmission

Gear Ratios:

1st: 3.636, 2nd: 2.157, 3rd: 1.529, 4th: 1.181, 5th: 0.974, 6th: 0.775

Type:

None (STI exclusively manual)

Dccd:

Driver Controlled Center Differential (DCCD) with Auto/Manual modes.

System:

Symmetrical All-Wheel Drive (SAWD) with front helical LSD and rear mechanical LSD.

📐 Dimensions

Length:

179.5 inches (4560 mm)

Width:

70.7 inches (1795 mm)

Height:

58.1 inches (1475 mm)

Wheelbase:

104.0 inches (2640 mm)

Ground Clearance:

5.0 inches (127 mm)

Curb Weight:

Approx. 3373 lbs (1530 kg)

Gross Vehicle Weight Rating:

Approx. 4387 lbs (1990 kg)

🛡️ Safety Features

NHTSA Front Crash:

5-Star

NHTSA Side Crash:

5-Star

NHTSA Rollover:

4-Star

ABS:

Anti-lock Braking System (ABS) with EBD (Electronic Brake-force Distribution).

Traction Control:

Vehicle Dynamics Control (VDC) with Sport Mode.

AWD:

Symmetrical All-Wheel Drive (SAWD) for enhanced stability and traction.

Airbags:

Front dual-stage airbags, front side-impact airbags, side curtain airbags.

Seatbelts:

3-point height-adjustable front seatbelts with pre-tensioners and force limiters, rear 3-point seatbelts.

Child Anchors:

LATCH (Lower Anchors and Tethers for CHildren) system.

💡 Technology Features

Head Unit:

Standard AM/FM/CD/MP3 audio system with auxiliary input. Optional navigation system.

Speakers:

6-speaker audio system.

Cruise Control:

Standard electronic cruise control.

Keyless Entry:

Standard keyless entry and engine immobilizer.

Usb:

Auxiliary input jack for audio devices.

Si Drive:

Subaru Intelligent Drive (SI-DRIVE) system allowing driver to select between Intelligent, Sport, and Sport Sharp modes, affecting throttle response, engine mapping, and VDC parameters.

🔧 Maintenance

Oil Change:

Every 3,750 miles (6,000 km) or 6 months, whichever comes first (severe driving conditions) / 7,500 miles (12,000 km) or 12 months (normal driving).

Air Filter:

Every 15,000 miles (24,000 km) or 12 months.

Cabin Filter:

Every 15,000 miles (24,000 km) or 12 months.

Spark Plugs:

Every 30,000 miles (48,000 km).

Coolant Flush:

Every 30,000 miles (48,000 km) or 24 months.

Transmission Fluid:

Every 30,000 miles (48,000 km) for manual transmission.

Engine Oil:

SAE 5W-30, API SN or ILSAC GF-5 certified (Subaru Extra Strength or equivalent).

Engine Oil Capacity:

5.7 US quarts (5.4 L) with filter change.

Transmission Fluid:

Subaru Extra-S or equivalent SAE 75W-90 GL-5 gear oil.

Differential Fluid:

Subaru Extra-S or equivalent SAE 75W-90 GL-5 gear oil.

Coolant:

Subaru Super Coolant (Blue) or equivalent ethylene glycol-based coolant with long-life additives, pre-mixed 50/50 with distilled water.

Engine Ring Land Failure:

Susceptibility of EJ257 ring lands to failure under aggressive tuning or sustained high-boost conditions without proper supporting modifications. Manual addresses proper engine operation and diagnostics.

Clutch Wear:

Can be accelerated by aggressive driving. Manual provides inspection and replacement procedures.

Rear Differential Issues:

Some models may experience differential noises or premature wear. Manual details inspection and fluid change procedures.

📚 Vehicle History

Rally Roots:

Subaru's strong heritage in World Rally Championship (WRC) racing.

Generations:

Fifth generation Impreza WRX STI (GVB/GRB chassis).

Previous Generations:

GC8, GD, GE/GH/GR.

Manufacturing Location:

Ota City, Gunma Prefecture, Japan.

Production Period:

2011-2014 (for this specific generation).

🏆 Awards & Recognition

Car And Driver:

Frequently appeared on Car and Driver's '10Best' lists in previous generations, recognizing its performance credentials.

Performance Reviews:

Consistently praised by automotive journalists for its handling, grip, and powertrain response.

Emissions Standards:

Meets EPA and CARB emissions standards for its model year.