Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2004 Subaru Impreza RS, AutomaticFACTORY OEM SERVICE PROCEDURE
External Pages
These are pages that do not belong to the exact selected vehicle (2004 Subaru Impreza RS, Automatic), but are still accessible from a link in your vehicle's manual. Be very cautious using repair info from here because these pages may not apply to your vehicle.
- Different variant/trim
- Section 1 (Generators & Regulators (Outback Sport))
- Section 2 (Fuel Injection (Fuel Systems) (H4DOTC))
- Section 3 (Emission Control (Aux. Emission Control Devices) (H4DOTC))
- Section 4 (Intake (Induction) (H4DOTC))
- Section 5 (Engine Mechanical (H4DOTC))
- Section 6 (Exhaust (H4DOTC))
- Section 7 (Engine Cooling System (H4DOTC))
- Section 8 (Lubrication (H4DOTC))
- Section 9 (Ignition (H4DOTC))
- Section 10 (Engine (Diagnostics) (H4DOTC))
- Section 11 (FUEL INJECTION (FUEL SYSTEMS) (STi))
- Section 12 (EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) (STi))
- Section 13 (INTAKE (INDUCTION) (STi))
- Section 14 (ENGINE MECHANICAL (STi))
- Section 15 (Exhaust (STI))
- Section 16 (LUBRICATION (STi))
- Section 17 (IGNITION (STi))
- Section 18 (ENGINE (DIAGNOSTICS) (STi))
- Section 19 (Manual Transmission & Differential (6-Speed))
- Section 20 (Clutch System)
- Section 21 (Engine Cooling System (H4DOTC) - Mechanism & Function)
- Section 22 (Manual Transmission And Differential (5-Speed))
- Section 23 (Diagnostic Trouble Code (DTC) Detecting Criteria (H4DOTC))
- Section 24 (Diagnostic Trouble Code (DTC) Detecting Criteria (STI))
- Different car
- Section 1 (Engine Controls - On-Vehicle Adjustments)
- Section 2 (System Wiring Diagrams)
- Section 3 (Engine Controls - Service & Adjustment Specifications)
- Section 4 (Engine Controls - On-Vehicle Adjustments)
- Section 5 (Engine Controls - Basic Diagnostic Procedures)
- Section 6 (Engine Controls - Trouble Shooting - No Codes)
- Section 7 (Engine Controls - System & Component Testing)
- Section 8 (Engine Controls - Pin Voltage Charts)
- Section 9 (Vacuum Diagrams)
- Section 10 (Engine Controls - Self-Diagnostics - 2.5L)
- Section 11 (Self-Diagnostics - 2.0L)
- Section 12 (System Wiring Diagrams)
- Section 13 (Air Bag Restraint Systems)
- Section 14 (Engine Controls - Removal & Installation - Forester)
- Section 15 (Engine Controls - Removal & Installation - IMPREZA & Outback Sport)
- Section 16 (Common Specs & Procedures)
- Section 17 (Specifications & Procedures)
- Section 18 (System Wiring Diagrams)
- Section 19 (Specifications & Drive Belt Routing)
- Section 20 (A/T Servicing)
- Section 21 (Front Suspension)
- Section 22 (Rear Suspension)
- Section 23 (A/T Control Systems)
- Section 24 (Overhaul)
- Section 25 (Exterior/Interior Trim)
- Section 26 (Automatic Transmission (Diagnostics))
- Section 27 (Manual Transmission & Differential)
- Section 28 (Clutch System)
- Section 29 (Exhaust System (H4SO))
- Section 30 (Exhaust System (H4DOTC))
- Section 31 (Air Intake System (H4DOTC))
- Section 32 (Air Intake System (H4SO))
- Section 33 (HVAC)
- Section 34 (Lighting Systems)
- Section 35 (Washer System & Wiper System)
- Section 36 (Seats)
- Section 37 (Engine Mechanical - 2.5L - SOHC)
- Section 38 (Engine Mechanical - 2.0L DOHC/TC)
- Section 39 (Engine Cooling System)
- Section 40 (Engine Lubrication System)
- Section 41 (Ignition System - SOHC)
- Section 42 (Ignition System - DOHC/TC)
- Section 43 (Fuel System - SOHC)
- Section 44 (Fuel System - DOHC/TC)
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.