🏷️ Basic Information

Make:

Subaru

Model:

Impreza WRX STI

Year:

2012

Product Name:

Subaru Impreza WRX STI 2012 All Service Repair Manual Download

Generation Code:

GV/GR

Chassis Code:

GRF (Hatchback)

👋 Introduction

Positioning:

The 2012 Subaru Impreza WRX STI represents a highly focused performance variant within the compact car segment, catering to enthusiasts seeking rally-inspired driving dynamics and turbocharged power.

Competitors:

Competed against models like the Mitsubishi Lancer Evolution, Ford Focus RS (in some markets), Volkswagen Golf GTI/R, and the Mazdaspeed3.

Performance Focus:

Signature Symmetrical All-Wheel Drive, potent turbocharged boxer engine, performance-tuned suspension, driver-centric cockpit.

Manual Value Proposition:

Provides detailed, accurate information essential for maintaining the peak performance and reliability of this enthusiast-focused vehicle, empowering owners and independent mechanics.

📋 Manual Details

General Coverage:

All mechanical and electrical systems, maintenance, repair, and troubleshooting.

Estimated Page Count:

1500+

Type:

Service and Repair Manual

Language:

English

Format:

Digital Download (PDF)

📖 Manual Coverage

Powertrain:

Engine (EJ257), Transmission (6-speed Manual), Drivetrain (Symmetrical AWD), Fuel System, Exhaust System.

Chassis:

Suspension (Front: MacPherson Strut, Rear: Double Wishbone), Steering (Power Rack and Pinion), Brakes (ABS, Brembo calipers), Wheels and Tires.

Electrical:

Wiring Diagrams, Lighting, Ignition, Starting System, Charging System, Body Electronics, Instrument Cluster, Audio System.

Body And Interior:

Body Panels, Doors, Windows, Seats, HVAC System, Safety Restraints (Airbags, Seatbelts).

Maintenance:

Routine checks, fluid changes (oil, coolant, brake fluid), filter replacements, spark plug replacement, belt inspection/replacement.

Diagnostics:

Troubleshooting guides, symptom-based diagnostics, DTC (Diagnostic Trouble Code) interpretation, component testing.

Repair Procedures:

Engine overhaul, transmission rebuild, brake caliper replacement, suspension component replacement, electrical component repair.

Specifications And Data:

Torque specifications, clearances, fluid capacities, electrical parameters, diagnostic values.

Depth:

Comprehensive from basic fluid checks and tire rotations to complete engine and transmission rebuilds, including detailed wiring schematics and diagnostic procedures.

📊 Manual Specifications

File Type:

PDF

Searchable:

Yes

Printable:

Yes

Quality:

High-resolution scans of original manufacturer documentation.

Binding:

N/A (Digital Download)

Paper:

N/A (Digital Download)

⚙️ Engine Specifications

Engine Code:

EJ257

Engine Type:

2.5L Turbocharged Boxer-4

Displacement:

2457 cc (2.5 Liters)

Bore X Stroke:

99.5 mm x 79.0 mm

Compression Ratio:

8.2:1

Horsepower:

305 hp @ 6000 rpm (SAE Net)

Torque:

290 lb-ft @ 4000 rpm (SAE Net)

Fuel Delivery:

Multi-point Fuel Injection (MPI) with Electronic Throttle Control (ETC)

Fuel Type:

Premium Unleaded Gasoline (91 Octane or higher recommended)

Turbocharger:

IHI VF52 (Variable Geometry)

Intercooler:

Top-mount, air-to-air

🔧 Transmission

Transmission Type:

6-Speed Manual Transmission (TY856UR1MA)

Optional Transmission:

N/A (Only Manual Available for WRX STI)

Drivetrain:

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

Differential Lock:

Front Helical Limited Slip Differential (LSD), Rear Mechanical Limited Slip Differential (LSD)

Manual Transmission Fluid:

Subaru Genuine Gear Oil (GL-4) or equivalent, 2.7 liters (Approx.)

📐 Dimensions

Length:

173.8 inches (4415 mm)

Width:

70.7 inches (1795 mm)

Height:

58.1 inches (1475 mm)

Wheelbase:

103.0 inches (2615 mm)

Track Width Front:

60.4 inches (1535 mm)

Track Width Rear:

60.4 inches (1535 mm)

Ground Clearance:

5.1 inches (130 mm)

Curb Weight:

Approx. 3,373 lbs (1530 kg)

Gross Vehicle Weight Rating Gvwr:

Approx. 4,500 lbs (2041 kg)

Cargo Volume:

11.3 cu ft (320 Liters)

🛡️ Safety Features

NHTSA Front Crash Rating:

5 Stars

NHTSA Side Crash Rating:

5 Stars

NHTSA Rollover Rating:

4 Stars

ABS:

Standard 4-wheel Anti-lock Braking System (ABS)

Traction Control:

Standard Traction Control System (TCS)

Electronic Stability Control:

Standard Vehicle Dynamics Control (VDC)

Airbags:

Driver and front passenger airbags, front side-impact airbags, side curtain airbags (front and rear).

Seatbelts:

3-point front and rear seatbelts with pretensioners and force limiters.

Child Anchors:

Lower Anchors and Tethers for CHildren (LATCH) system.

💡 Technology Features

Head Unit:

Standard AM/FM/CD stereo with auxiliary input and optional navigation system.

Audio System:

6-speaker audio system.

Cruise Control:

Standard electronic cruise control.

Bluetooth:

Available Bluetooth hands-free connectivity (optional feature).

Gauge Cluster:

Performance-oriented gauge cluster with boost gauge, tachometer, and multi-function display.

🔧 Maintenance

Engine Oil And Filter:

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

Engine Air Filter:

Inspect every 7,500 miles, replace as needed. Replace at 30,000 miles (normal duty).

Cabin Air Filter:

Replace every 15,000 miles or 12 months.

Spark Plugs:

Replace every 30,000 miles for iridium-tipped plugs.

Timing Belt Or Chain:

Uses a timing chain, generally maintenance-free. Inspect tensioner and guides if issues arise.

Brake Fluid:

Replace every 30,000 miles or 3 years.

Coolant:

Subaru Super Coolant (Blue). Replace at 30,000 miles or 3 years for initial change, then every 30,000 miles or 2 years thereafter.

Engine Oil:

SAE 5W-30, API SN or higher, ILSAC GF-5 certified (Subaru recommends synthetic).

Engine Oil Capacity:

5.5 US quarts (5.2 Liters) with filter change.

Brake Fluid Type:

DOT 3 or DOT 4.

Piston Ring Land Cracks:

Commonly associated with aggressive tuning or detonation, leading to oil consumption and reduced compression. Proper fueling and monitoring are critical.

Clutch Wear:

High-performance nature and manual transmission can lead to premature clutch wear with aggressive driving.

Turbocharger Failure:

Can occur due to oil starvation, overheating, or improper shutdown procedures after hard driving.

Suspension Bushings:

Can wear out over time, leading to clunking noises and reduced handling precision.

📚 Vehicle History

Rally Roots:

Subaru's long and successful history in the World Rally Championship (WRC) heavily influenced the development and appeal of the WRX STI.

Generation Notes:

The 2012 model is part of the third generation (GR/GV), often referred to as the 'hatchback era' for the WRX STI, known for its aggressive styling and refined performance.

Production Years:

2007-2014 (for GR/GV generation)

Manufacturing Location:

Ota, Gunma, Japan

🏆 Awards & Recognition

Performance Accolades:

Consistently praised by automotive journalists for its exceptional handling, rally-bred performance, and turbocharged power delivery.

Enthusiast Following:

Maintains a strong and dedicated enthusiast following due to its capabilities and tuning potential.