2004 Subaru Impreza Service and Repair Manual

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Factory-Grade Data

2004 Subaru Impreza service and repair manual — a detailed, factory-style reference for maintenance, diagnostics, and repair. Use it to confirm correct procedures, specifications, and system coverage before you start work.

Designed for technicians and DIY owners, this manual helps you diagnose issues correctly, follow proven repair steps, and use wiring diagrams and system sections to track faults faster.

What’s included

  • Step-by-step repair procedures and service information
  • Specifications and reference data (where provided)
  • Electrical diagnostics with wiring diagrams
  • Coverage across major systems: engine, transmission/driveline, brakes, steering, suspension, HVAC, and more

Trims covered

  • WRX Sedan 4-Door
  • Outback Wagon 4-Door
  • RS Sedan 4-Door
  • WRX Wagon 4-Door
  • TS Wagon 4-Door
  • WRX STI Sedan 4-Door

Engines covered

  • 2.0L 1994CC H4 GAS DOHC Turbocharged
  • 2.5L 2458CC H4 GAS SOHC Naturally Aspirated
  • 2.5L 2458CC H4 GAS DOHC Turbocharged

Index / Table of contents

  • Body
  • Brakes
  • Chassis Electrical
  • Driveline
  • Engine Cooling
  • Engine Electrical
  • Engine Mechanical
  • Engine Performance & Emission Controls
  • Fuel System
  • General Information & Identification
  • Heating, Ventilation, & Air Conditioning
  • Hybrid & Electric Vehicle Systems
  • Steering
  • Suspension
  • Transmission, Clutch, & Transfer Case
  • Wiring Diagrams

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Vehicle Safety Data

2004 Subaru Impreza Recalls & Complaints

NHTSA #04V12800016/03/2004Component: VEHICLE SPEED CONTROL:CABLES

ON CERTAIN PASSENGER SEDANS, WAGONS, AND SPORT UTILITY VEHICLES, THE CRUISE CONTROL CABLE COULD COME OUT OF ITS TRACK ON THE CRUISE CONTROL LEVER AND LODGE ON THE CONTROL LEVER TAB WHEN THE ACCELERATO

Consequence

IF THIS OCCURS DURING VEHICLE OPERATION, THE DRIVER COULD LOSE CONTROL OF THE VEHICLE, WHICH COULD R

Remedy

DEALERS WILL INSTALL A CRUISE CONTROL CABLE RETAINING CLIP TO THE CRUISE CONTROL LEVER TAB ON THE TH

NHTSA #23V07600013/02/2023Component: AIR BAGS:FRONTAL:PASSENGER SIDE:INFLATOR MODULE

Subaru of America, Inc. (Subaru) is recalling certain 2004-2005 Impreza and WRX vehicles that received replacement front passenger air bag inflators under a previous recall. The replacement air bag i

Consequence

An incorrectly installed inflator may not properly inflate the passenger air bag, increasing the ris

Remedy

Dealers will inspect the passenger inflator and if necessary, install a new inflator kit, free of ch

NHTSA #11V46400006/09/2011Component: SUSPENSION:FRONT:CONTROL ARM:LOWER ARM

SUBARU IS RECALLING CERTAIN MODEL YEAR 2002-2007 IMPREZA, MODEL YEAR 2003-2008 FORESTER, AND MODEL YEAR 2005-2006 SAAB 9-2X VEHICLES MANUFACTURED FROM SEPTEMBER 5, 2000 THROUGH NOVEMBER 26, 2007 ORIGI

Consequence

A BROKEN CONTROL ARM CAN RESULT IN THE LOSS OF CONTROL OF THE VEHICLE, INCREASING THE RISK OF A CRAS

Remedy

SUBARU WILL HANDLE THEIR VEHICLES AND SAAB WILL HANDLE THEIRS. DEALERS WILL INSPECT THE DEGREE OF C

NHTSA #20V00200002/01/2020Component: AIR BAGS:FRONTAL:PASSENGER SIDE:INFLATOR MODULE

Subaru of America, Inc. (Subaru) is recalling certain 2009-2013 Forester, 2003-2006 Baja, 2004-2011 Impreza, 2004-2014 WRX (including STI), 2003-2014 Legacy and Outback, and 2006 Saab 9-2X vehicles or

Consequence

An inflator explosion may result in sharp metal fragments striking the driver or other occupants res

Remedy

Subaru will notify their owners. General Motors will notify Saab owners. Dealers will replace the

NHTSA #20V00100002/01/2020Component: AIR BAGS:FRONTAL:PASSENGER SIDE:INFLATOR MODULE

Subaru of America, Inc. (Subaru) is recalling certain 2009-2013 Forester, 2003-2006 Baja, 2004-2011 Impreza, 2004-2014 WRX (STI included), 2003-2014 Legacy and Outback, and 2005-2006 Saab 9-2X vehicle

Consequence

An inflator explosion may result in sharp metal fragments striking the driver or other occupants res

Remedy

Subaru will notify their owners. General Motors will notify Saab owners. Dealers will replace the

NHTSA #20V00300002/01/2020Component: AIR BAGS:FRONTAL:PASSENGER SIDE:INFLATOR MODULE

Subaru of America, Inc. (Subaru) is recalling certain 2009-2013 Forester, 2003-2006 Baja, 2004-2011 Impreza, 2004-2014 WRX (including STI), 2003-2014 Legacy and Outback, and 2005-2006 Saab 9-2X vehicl

Consequence

An inflator explosion may result in sharp metal fragments striking the driver or other occupants res

Remedy

Subaru will notify their owners. General Motors will notify Saab owners. Dealers will replace the

NHTSA #04V47300001/10/2004Component: ENGINE AND ENGINE COOLING

ON CERTAIN PASSENGER AND SPORT UTILITY VEHICLES, THE COVER BOLTS FOR THE ENGINE OIL CONTROL VALVE MAY NOT BE SUFFICIENTLY TIGHTENED, ALLOWING OIL TO LEAK FROM AROUND THE COVER GASKET.

Consequence

IF LEAKING OIL CONTACTS COMPONENTS OPERATING AT HIGH TEMPERATURES, A FIRE COULD RESULT IN THE ENGINE

Remedy

DEALERS WILL INSPECT AND RETIGHTEN THE OIL-FLOW CONTROL VALVE COVER BOLTS. THE RECALL BEGAN ON OCTO

TSB #11032040

This bulletin announces the service manual correction regarding clutch master cylinder reservoir service procedures.

TSB #11032039

This bulletin contains additional information for recommended materials listed in the Service Manuals for individual models.

TSB #11032035

This Bulletin provides the diagnostic procedures to be followed when addressing customer concerns of steering wheel/vehicle body vibration when driving at highway speeds when tire/wheel balance is suspected.

TSB #11032034

This Service Information Bulletin was developed to provide interim guidance for vehicles exhibiting DTC B2A20.

TSB #11030567

This bulletin contains information to help when attempting to complete the STARLINK Telematics subscription process, an Error Code 202 and / or 204 may occur preventing the process from completing successfully

TSB #11030561

This announcement provides information on the use of aftermarket services or tools for programming immobilizer keys/fobs.

TSB #11030560

This bulletin announces the new procedure and Warranty Fail Code for FirstTime air conditioning (A/C) performance concerns possibly resulting from an undetected A/C refrigerant leak.

TSB #11030557

This bulletin contains additional information for recommended materials listed in the Service Manuals for individual models.

Showing the 8 most recent of 196 technical service bulletins on file with NHTSA.

20080801Component: ENGINE AND ENGINE COOLING:ENGINECrash reportedFire reported

I WAS DRIVING DOWN A MAIN ROAD IN BOSTON WHEN MY ENGINE CAUGHT ON FIRE. AS A RESULT I ENDED UP CRASHING INTO A SNOW BANK. WHEN I REPORTED THIS TO THE DEALERSHIP THEY SAID THAT THEY WOULD LOOK AT THE P

20080801Component: ENGINE AND ENGINE COOLING:EXHAUST SYSTEMCrash reportedFire reported

I WAS DRIVING DOWN A MAIN ROAD IN BOSTON WHEN MY ENGINE CAUGHT ON FIRE. AS A RESULT I ENDED UP CRASHING INTO A SNOW BANK. WHEN I REPORTED THIS TO THE DEALERSHIP THEY SAID THAT THEY WOULD LOOK AT THE P

20080801Component: FUEL SYSTEM, GASOLINECrash reportedFire reported

I WAS DRIVING DOWN A MAIN ROAD IN BOSTON WHEN MY ENGINE CAUGHT ON FIRE. AS A RESULT I ENDED UP CRASHING INTO A SNOW BANK. WHEN I REPORTED THIS TO THE DEALERSHIP THEY SAID THAT THEY WOULD LOOK AT THE P

20081117Component: VEHICLE SPEED CONTROL:CABLESCrash reported1 injured

TL*THE CONTACT OWNS A 2004 SUBARU IMPREZA. WHEN THE CONSUMER SAT IN THE VEHICLE WITH THE EMERGENCY BRAKE ON, THE VEHICLE TOOK OFF ON ITS OWN. IN ADDITION, THE CRUISE CONTROL LIGHT ILLUMINATED INTER

20060224Component: AIR BAGSCrash reported1 injured

2004 WRX SEDAN AIR BAGS DID NOT DEPLOY UPON IMPACT. *TS THE CONSUMER SUSTAINED FACIAL CONTUSIONS AND MEMORY LOSS. *NM

Showing the 5 most serious of 113 complaints filed with NHTSA.

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