Engine Mechanical:
Engine overhaul, cylinder head, block, pistons, crankshaft, camshafts, timing system
Engine Electrical:
Ignition system, starter, alternator, sensors, engine control unit (ECU) wiring diagrams
Fuel System:
Fuel pump, injectors, fuel lines, evaporative emission control (EVAP)
Cooling System:
Radiator, water pump, thermostat, hoses, cooling fan
Exhaust System:
Manifolds, catalytic converter, mufflers, pipes
Transmission Manual:
Clutch, gearbox overhaul, shift linkage
Transmission Automatic:
Transmission overhaul, valve body, torque converter, gear selection
Drivetrain AWD:
Center differential, rear differential, driveshafts, viscous coupling unit (VCU)
Suspension Front:
Struts, control arms, ball joints, sway bar
Suspension Rear:
Multi-link suspension, trailing arms, shocks, springs
Brakes Front:
Disc brakes, calipers, rotors, pads, brake lines
Brakes Rear:
Disc brakes, calipers, rotors, pads, parking brake mechanism
Steering:
Power steering pump, rack and pinion, steering column, tie rods
Electrical Body:
Lighting, power windows, locks, wipers, horn, interior/exterior lighting
HVAC:
Air conditioning, heater core, blower motor, climate control panel
Body Chassis:
Frame, body panels, doors, hood, trunk, glass replacement
Diagnostic Troubleshooting:
Error codes, symptom-based diagnostics, wiring diagrams for troubleshooting
Routine Maintenance:
Oil change, filter replacement, spark plug replacement, fluid checks
Component Repair:
Engine rebuild, transmission repair, brake caliper replacement, suspension component renewal
Troubleshooting Guides:
Systematic diagnosis of common and uncommon faults
Wiring Diagrams:
Comprehensive electrical schematics for all systems
Torque Specifications:
Detailed torque values for all critical fasteners
Specifications Data:
Engine output, dimensions, weights, tire pressures, fluid capacities
Body Work Repair:
Panel replacement, dent repair, rust treatment guidance
Wheel Alignment:
Alignment specifications for front and rear suspension
Depth:
Comprehensive (from basic maintenance to full engine and transmission rebuilds)
Engine Code:
EJ251 (2.5L NA), EJ205 (2.0L Turbo - WRX)
Engine Type:
Horizontally-opposed (Boxer) SOHC/DOHC
Displacement:
2457 cc (2.5L NA), 1994 cc (2.0L Turbo)
Horsepower Na:
165 hp @ 5600 rpm (EJ251)
Torque Na:
166 lb-ft @ 4000 rpm (EJ251)
Horsepower Turbo:
227 hp @ 5600 rpm (EJ205 - WRX)
Torque Turbo:
217 lb-ft @ 4000 rpm (EJ205 - WRX)
Fuel Delivery:
Electronic Fuel Injection (EFI)
Fuel Type:
Unleaded gasoline (91+ octane recommended for WRX)
ECU Type:
Denso (specific model varies)
Oil Change Interval:
Every 3,750 miles (severe) or 7,500 miles (normal) with synthetic oil, or as per Subaru's recommendation
Engine Air Filter Replacement:
Every 15,000 - 30,000 miles
Cabin Air Filter Replacement:
Every 15,000 - 30,000 miles
Spark Plug Replacement:
Every 60,000 - 100,000 miles (depending on plug type)
Timing Belt Replacement:
75,000 miles or 5 years (Non-interference engine, but belt failure is catastrophic)
Engine Oil Type:
SAE 5W-30 (API Certified)
Coolant Type:
Subaru Super Coolant (Blue) or equivalent ethylene glycol based antifreeze
Transmission Fluid Manual:
GL-5 Gear Oil (75W-90 recommended)
Transmission Fluid Automatic:
ATF-HP (Subaru) or Dexron III compatible
Differential Fluid Front Rear:
GL-5 Gear Oil (75W-90 recommended)
Brake Fluid Type:
DOT 3 or DOT 4
Head Gaskets:
Less prevalent than previous generations, but still a potential concern (especially on EJ25)
Viscous Coupling Unit:
Potential for premature wear or failure leading to AWD system issues
Turbo Failure Wrx:
Can occur due to lack of oil changes or severe driving conditions
Catalytic Converter:
Can become clogged over time, affecting performance