SubaruImpreza2003Overview/subaru/impreza/2003/base/

2003 Subaru Impreza

Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 2003 Impreza.

Body PASSENGER CAR

The 2003 Subaru Impreza arrives as a passenger car requiring 4.3 quarts of 5W-30 API oil for routine service. With only 64 owner complaints logged against six recalls, and fuel system issues marking the primary trouble spot, this model year sits well below the 2002 peak of 300 complaints—the highest in the nameplate's 1990–2026 timeline. That substantial drop in reported issues positions the 2003 edition as a comparatively settled entry in the Impreza's reliability history.

Model year202620252024202320222021202020192003

Quick specs

Fluid capacities, tune-up values and fuel economy at a glance.

Engine oil capacity4.3 qtOEM · verified
Engine oil type5W-30 APIOEM · verified
Lug nut torque58-72 ft-lbsOEM · verified

Fitment & sizes

Replacement part sizes and factory part numbers — battery, bulbs, filters and belts.

From the factory this vehicle uses a BCI 35 · 360 CCA battery. Each part links to every other vehicle that shares it, so a part you already stock may fit more of your fleet than you'd expect.

Battery groupBCI 35 · 360 CCAOEM · verified

Full specifications

Engine, drivetrain, dimensions and economy.

Dimensions & weight NHTSA vPIC

Overall length173.6 in
Overall width68.1 in
Overall height57.9 in
Wheelbase99.6 in
Curb weight2965 lb
Track (front / rear)58.3 / 57.5 in
Weight distribution (front / rear)59/41

Performance & power Independent road tests

0–60 mph, quarter-mile, horsepower and torque from independent road tests.

Independent road tests for the Impreza of this era, listed by trim and engine — this page spans more than one engine, so no single horsepower figure is shown.

7.8–7.9 sec0–60 mph (tested)quickest 7.80 sec — 2002 2.5RS Sedan
YearTrim / engine0–60¼ mileHPDrivetrain
20022.5RS Sedan 2.5L F-47.80 sec16.10 sec165 hpAWD
20002.5RS Sedan 2.5L F-47.80 sec15.90 sec165 hpAWD
20072.5i Sedan 2.5L F-47.90 sec16.00 sec173 hpAWD

Service quick specs OEM factory data

Capacities, torques and tune-up values from the factory service manual.

This engine holds 4.3 qt of 5W-30 API engine oil, 75W-90 · GL-5 in the differential, DOT 3 brake fluid. Torque lug nuts to 58-72 ft-lbs, the oil drain plug to 33.0 ft-lbs. The firing order is 1-3-4-2. Note the cylinder-head bolts finish on a torque angle (torque-to-yield) — they stretch permanently and should be replaced, not reused, during any head service.

Lubricants & capacities

Brake FluidDOT 3
Differential Gear Oil75W-90 · GL-5
Differential Gear Oil Capacity1.7 Pints
Engine CoolantETHYLENE GLYCOL
Engine Oil5W-30 · API
Engine Oil Capacity4.3 qt
Engine Oil5W-30 · API
Engine Oil Capacity4.8 qt

Engine torques

Connecting Rod (Large End) Bearings33 ft-lbs
Connecting Rod (Large End) Bearings33 ft-lbs
Engine Flywheel Bolts53 ft-lbs
Engine Flywheel Bolts53 ft-lbs
Engine Oil Pan Drain Plug33.0 ft-lbs
Oil Pump to Cylinder BLock Bolts/Studs5 ft-lbs
Oil Pump to Cylinder BLock Bolts/Studs5 ft-lbs

Chassis torques

Lug Nuts58-72 ft-lbs
Transfer Case Drain Plug17.0-20.0 ft-lbs
Front Wheel Hub140 ft-lbs
Rear Wheel Hub140 ft-lbs

Ignition

Cylinder Firing Order1-3-4-2
Curb Idle Speed (No Load)750 rpm
Curb Idle Speed Variance (No Load)100 rpm
Curb Idle Speed (No Load)MT: 650, AT: 700 rpm
Curb Idle Speed Variance (No Load)100 rpm
Ignition Coil Primary Resistance.66-.80 ohms
Ignition Coil Secondary Resistance10,880-14,720 ohms
Spark Plug ManufacturerChampion

Battery & A/C

RefrigerantR134a
Refrigerant Capacity0.99-1.50 lbs
Oil GroupPAG
Oil Capacity4.90 oz
Standard BCI Group Number35
Standard BCI Cranking Performance360 cca
Standard BCI Group Number35
Standard BCI Cranking Performance360 cca

Service checks

Injector Primary Resistance5-20 ohms
Injector Primary Resistance5-20 ohms
Engine Compression142-171 psi
Engine Compression148-185 psi
Engine Oil Pressure14 psi @ 600 rpm, 43 psi @ 5000

Brakes

Brake ApplicationWITH REAR DISC / WITH STANDARD
Torque Caliper to Bracket58 ft-lbs / 24-31 ft-lbs
Torque to Knuckle58 ft-lbs
Minimum Pad ThicknessFront: 0.295; Rear: 0.256 specification
Brake ApplicationWITH REAR DISC / WITH STANDARD
Rotor Runout Limit0.0029 in / 0.0028 in
Rotor Nominal Thickness From0.394 in / 0.945 in
Rotor Nominal Thickness To0.394 in / 0.945 in

Multi-step torque procedures OEM · verified

Cylinder Head — tightening sequence 8 stages
122 ft. lbs.22 ft. lbs
251 ft. lbs.51 ft. lbs
3Loosen 180 degrees.180 degrees
4Loosen 180 degrees.180 degrees
529 ft. lbs.29 ft. lbs
680-90 degrees.80–90 degrees
740-45 degrees.40–45 degrees
840-45 degrees.40–45 degrees

Factory maintenance schedule OEM · verified

Normal service, condensed from the factory interval matrix.

Under the factory schedule, replace the engine oil and filter at 3,000 mi; coolant every 30,000 mi. The big-interval services (every 30,000 mi for coolant, and the transmission fluid) are the ones owners most often skip — on a lower-mileage example, assume the original fluids are still in it and check them first.

At 3,000 miEngine Oil (drain & refill) · Engine Oil Filter (replace)
Every 7,500 miCabin Air Filter (replace) · Engine Oil (drain & refill) · Engine Oil Filter (replace) · Tire & Wheel Assembly (rotate)
Every 15,000 miAxle Shaft Oil Seal (inspect) · Brake Line (inspect) · CV Joint Boot (inspect) · Clutch Assembly (inspect) · Parking Brake System (inspect) · Power Steering System (inspect)
Every 30,000 miBrake Drum Assembly (inspect) · Brake Hydraulic System (drain, refill & bleed) · Brake Linings (inspect) · Differential (inspect fluid level) · Engine Air Filter Element (replace) · Engine Coolant System (leak inspection)
At 105,000 miAccessory Drive Belt (inspect) · Drive Belt (replace) · Timing Belt (replace)

Reliability & federal safety record

Owner-reported issues, recalls, investigations and service bulletins on record with NHTSA — an unfiltered look at what owners actually experience.

The 2003 Impreza occupies a notable position in its generation: it follows the 2002 redesign, which generated an extraordinary 300 complaints, 6 recalls, and 4 investigations — by far the highest complaint volume in the entire dataset. By 2003, complaints dropped sharply to 64, yet recalls held steady at 6 and investigations actually rose to 5, the generation's peak, suggesting federal regulators were still actively scrutinizing carryover issues from the launch year even as consumer-reported problems subsided. Complaints then ticked back up to 96 in 2004 before stabilizing in the 56–75 range through 2007, placing 2003 at the front of a downward-complaint arc that the generation never fully reversed. The top complaint areas — Fuel System Gasoline (13), Service Brakes Hydraulic (13), and Fuel/Propulsion System (12) — cluster heavily around fuel and braking systems, with 8 crash complaints and 1 fire complaint recorded; the data does not specify root causes for these. With recall and investigation counts matching or exceeding the troubled 2002 launch year despite the lower complaint total, 2003 is not a clean break from the generation's early problems. For a used buyer, 2003 represents a moderate improvement over 2002 but still carries the regulatory scrutiny of a first-generation-refresh year — verify all recalls are completed and scrutinize fuel and brake systems specifically before purchasing.

6
Open recalls
NHTSA campaigns
144
Service bulletins
Manufacturer communications
5
ODI investigations
Office of Defects Investigation
64
Owner complaints
8 involved a crash · 1 a fire
NHTSA crash-test rating federal NCAP · out of 5 stars
Rollover★★★★

Owner complaints filed with NHTSA, by component

All 64 complaints on record, top 8 components.

Fuel System, Gasoline13
Service Brakes, Hydraulic13
Fuel/Propulsion System12
Engine & Engine Cooling4
Suspension3
Air Bags3
Structure2
Visibility2

Source: NHTSA Office of Defects Investigation complaint database.

Recalls NHTSA · verified

Showing 2 of 6 campaigns on record for this vehicle.

11V464000Suspension:Front:Control Arm:Lower ArmReported 06/09/2011

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 ORIGINALLY SOLD, OR… Remedy: SUBARU WILL HANDLE THEIR VEHICLES AND SAAB WILL HANDLE THEIRS. DEALERS WILL INSPECT THE DEGREE OF CORROSION OF THE FRONT LOWER CONTROL ARMS, AND WILL EITHER RUSTPROOF OR REPLACE…

08V135000Latches/Locks/Linkages:Tailgate:LatchReported 24/03/2008

SUBARU IS RECALLING 36,791 MY 2002-2003 IMPREZA WAGONS. THE STUD BOLT(S) OF REAR GATE STAY MAY HAVE BEEN TIGHTENED WITH INSUFFICIENT TIGHTENING TORQUE AND A GAP MAY HAVE RESULTED BETWEEN THE REAR GATE PANEL AND STUD… Remedy: DEALERS WILL INSPECT TO SEE IF THERE IS ANY GAP AT THE STUD BOLT OF THE REAR GATE STAY INSTALLATION. IF A GAP IS FOUND, THE STUD BOLT WILL BE REMOVED TO CHECK FOR DAMAGE TO THE…

Technical service bulletins NHTSA · verified

Showing 5 of 144 bulletins on record with NHTSA.

BulletinDateComponentSummary
SubaruNet Annoucement (E2026-06-11Unknown Or OtherThis announcement is requesting retailer staff to retain the EyeSight protective hood…
01-167-08R2026-05-18Unknown Or OtherThis bulletin contains additional information for recommended materials listed in the…
SubaruNet Announcement (R2026-05-04Power TrainThis announcement provides information on the remanufactured CVT transmission program.
07-240-26R2026-04-30Unknown Or OtherThis Service Information Bulletin was developed to provide interim guidance for vehicles…
03-97-262026-04-24Power TrainThis bulletin announces the service manual correction regarding clutch master cylinder…

Common OBD-II trouble codes

The most common OBD-II codes for this vehicle's emissions system. These are standardized SAE J2012 definitions, not vehicle-specific fault reports.

P0420
Catalyst system efficiency below threshold — Bank 1
P0300
Random / multiple cylinder misfire detected
P0171
System too lean — Bank 1
P0455
Evaporative emission system leak detected — large leak
P0128
Coolant thermostat below regulating temperature
P0442
Evaporative emission system leak detected — small leak

VIN tools

Decode factory build data for a specific vehicle by VIN.

VIN
Decode a VIN to confirm the transmission and build data for a specific Impreza. OEM
Build data
Plant, GVWR class, engine and body data for any 17-character VIN.
Recalls
Check open recall campaigns against a specific vehicle by VIN.

Vehicles with shared specs

Find every vehicle that shares this one's battery, bulbs, oil capacity, platform or parts.

Reference guides

Cross-vehicle references for the kinds of data on this page.

Frequently asked

How much oil does the 2003 Impreza take?

4.3 qt of 5W-30 API SM, per the factory manual.

Does the 2003 Impreza have open recalls?

NHTSA lists 6 recall campaign(s) for this model year. Check your specific vehicle by VIN.