Toyota4runner2003V6/toyota/4runner/2003/v6/

2003 Toyota 4runner — V6

Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 2003 4runner V6.

Body SUVEngine V6Transmission Automatic 4-spd

The 2003 Toyota 4Runner is a V6-powered SUV equipped with a 4-speed automatic transmission, returning EPA figures of 16/20/18 mpg city/highway/combined and requiring 5.5 quarts of 5W-30 API oil at service intervals. Across the model's full complaint history spanning 1990 through 2026, this year stands out for all the wrong reasons: its 707 owner complaints — concentrated in the Structure category — make it the single highest-complaint year on record, paired with 3 recalls. For researchers, that means the 2003 model year represents a notable reliability low point in the 4Runner lineage and warrants close attention to structural concerns when evaluating this generation.

Model year200420032000199919981995199419931992

Quick specs

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

Engine oil capacity5.5 qtOEM · verified
Engine oil type5W-30 APIOEM · verified
Lug nut torque83 ft-lbsOEM · verified
EPA fuel economy16/20/18 mpgEPA · verified

Fitment & sizes

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

From the factory this vehicle uses a BCI 24F · 585 CCA battery, OE oil filter 90915YZZD3. 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 24F · 585 CCAOEM · verified
Tail / brake / turnHOTOEM · verified
Tire sizeP265-65R17OEM · verified
Wheel / rim7.5-JJ inOEM · verified

OE service part numbers OEM · verified

Engine oil filter90915YZZD3
Engine air filter178010P010 alt 1780150040
Fuel filter2330050120
Front wiper blades8521253061 alt 8522248040
Serpentine belt99367H2120 alt 9091602586
Thermostat9091603100 alt 1632631050
Cabin air filter871394701083

Full specifications

Engine, drivetrain, dimensions and economy.

Engine & drivetrain NHTSA vPIC

TransmissionAutomatic 4-spd

Dimensions & weight NHTSA vPIC

Overall length187.8 in
Overall width74 in
Overall height68.5 in
Wheelbase109.4 in
Curb weight4288 lb
Track (front / rear)62.2 / 61.8 in
Weight distribution (front / rear)54/46

Ratings & economy EPA / vPIC

EPA city / highway / combined16 / 20 / 18 mpg
DrivetrainRear-Wheel Drive
Recommended fuelRegular Gasoline

Service quick specs OEM factory data

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

This engine holds 5.5 qt of 5W-30 API engine oil, 75W-90 · GL-5 in the differential, DOT 3 brake fluid. Torque lug nuts to 83 ft-lbs, the oil drain plug to 29.0 ft-lbs. The firing order is 1-2-3-4-5-6.

Lubricants & capacities

Brake FluidDOT 3
Differential Gear Oil75W-90 · GL-5
Differential Gear Oil Capacity2.5 Pints
Engine Oil5W-30 · API
Engine Oil Capacity5.5 qt
Engine Oil5W-30 · API
Engine Oil Capacity6.5 qt
Transfer Case Fluid75W-90 · GL-4 · GL-5

Engine torques

Camshaft Bearing/Carrier Cap Bolts or Studs10MM Bolts: 7 ft-lbs, 12MM Bolts: 18 ft-lbs
Crankshaft Pulley and/or Damper Bolts184 ft-lbs
Crankshaft Pulley and/or Damper Bolts181 ft-lbs
Engine Flywheel Bolts61 ft-lbs
Engine Oil Pan Drain Plug30.0 ft-lbs
Engine Oil Pan Drain Plug29.0 ft-lbs
Oil Pump to Cylinder BLock Bolts/Studs7 ft-lbs
Oil Pump to Cylinder BLock Bolts/Studs14MM

Chassis torques

Lug Nuts83 ft-lbs
Transfer Case Fill Plug27.0 ft-lbs
Transfer Case Drain Plug27.0 ft-lbs
Front Wheel Hub159 ft-lbs
Rear Wheel Hub159 ft-lbs
Front Wheel Hub174 ft-lbs

Ignition

Cylinder Firing Order1-2-3-4-5-6
Curb Idle Speed (No Load)700 rpm
Curb Idle Speed Variance (No Load)50 rpm
Curb Idle Speed (No Load)700 rpm
Curb Idle Speed Variance (No Load)50 rpm
Spark Plug ManufacturerDenso
Spark Plug Gap0.039-0.043 in
Spark Plug Torque13.0 ft-lbs

Battery & A/C

RefrigerantR134a
Refrigerant Capacity1.25-1.38 lbs
Oil GroupPAG
Oil Type46
Oil Capacity4.50 oz
Standard BCI Group Number24F
Standard BCI Cranking Performance585 cca
Optional BCI Group Number27F

Service checks

Injector Primary Resistance13.4-14.2 na ohms
Injector Primary Resistance11.6-12.4 @ 68 degreesF ohms
Engine Compression145-189 psi
Engine Compression142-192 psi
Engine Oil Pressure4.3 psi @ Idle, 43-85 psi @ 3000 rpm psi

Brakes

Torque to Knuckle90 ft-lbs
Minimum Pad ThicknessFront: 0.039; Rear: 0.039 in
Minimum Shoe Thickness0.039 in
Rotor Runout Limit0.0028 in
Rotor Nominal Thickness From0.866 in
Rotor Nominal Thickness To0.866 in
Rotor Discard at or Under0.787 in
Drum Nominal Diameter11.614 in

Multi-step torque procedures OEM · verified

Connecting Rod (Large End) Bearings — tightening sequence 1 stages
118 ft. lbs., Step 2: 9018 ft. lbs
Connecting Rod (Large End) Bearings — tightening sequence 1 stages
118 ft. lbs., Step 2: 9018 ft. lbs
Engine Flywheel Bolts — tightening sequence 1 stages
122 ft. lbs., Step 2: 9022 ft. lbs
Main Bearings — tightening sequence 1 stages
120 ft. lbs., Step 2: 9020 ft. lbs

Factory maintenance schedule OEM · verified

Normal service, condensed from the factory interval matrix.

Under the factory schedule, replace the engine oil and filter every 7,500 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.

Every 7,500 miEngine Oil (drain & refill) · Engine Oil Filter (replace) · Tire & Wheel Assembly (rotate)
Every 15,000 miAccessory Drive Belt (inspect) · Brake Drum Assembly (inspect) · Brake Line (inspect) · Brake System (inspect) · CV Joint Boot (inspect) · Differential (inspect fluid level)
Every 22,500 miCabin Air Filter (replace)
Every 30,000 miAir Conditioning Condenser (inspect) · Engine Air Filter Element (replace) · Engine Coolant System (drain, flush & refill) · Fuel Evaporative Emission Control System Lines (inspect) · Fuel Line (inspect) · Fuel Tank (inspect)
At 60,000 miAccessory Drive Belt (inspect)
Every 60,000 miEngine Valves (inspect valve lash) · Fuel Evaporative Canister (inspect)
Every 90,000 miTiming 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 Toyota 4Runner sits at the absolute peak of its generation's federal complaint arc, with complaints surging to 707 from just 251 in 2002 and remaining elevated at 678 in 2004 before dropping to 424 in 2005. This target year is heavily dominated by Structure issues, which account for 206 of the complaints, followed by Engine & Engine Cooling (84) and Suspension,Structure (30), though the data does not specify the root cause for these failures. Concurrently, Technical Service Bulletins more than doubled from 113 in 2002 to 249 in 2003, indicating the manufacturer was issuing extensive service advisories to address the complexities of this specific model year. While the 2003 model saw 19 crash complaints and zero fire complaints, its unprecedented volume of structural and mechanical grievances makes it a statistical outlier within the vehicle's history. Given that 2003 represents the worst year for federal complaints across the entire dataset, this is not a good model year to buy; prospective buyers should strongly consider a 2005 or newer model where these initial, high-volume issues were significantly reduced.

3
Open recalls
NHTSA campaigns
249
Service bulletins
Manufacturer communications
2
ODI investigations
Office of Defects Investigation
707
Owner complaints
19 involved a crash · 0 a fire
NHTSA crash-test rating federal NCAP · out of 5 stars
Rollover★★★★★

Owner complaints filed with NHTSA, by component

All 707 complaints on record, top 8 components.

Structure206
Engine & Engine Cooling84
Unknown Or Other51
Suspension,Structure30
Suspension26
Service Brakes25
Power Train25
Service Brakes, Hydraulic21

Source: NHTSA Office of Defects Investigation complaint database.

Recalls NHTSA · verified

Showing 2 of 3 campaigns on record for this vehicle.

11V113000Vehicle Speed Control:Accelerator PedalReported 24/02/2011

TOYOTA IS RECALLING CERTAIN MODEL YEAR 2008 THROUGH 2011 LEXUS LX570, 2003 THROUGH 2009 TOYOTA 4RUNNER, AND 2006 THROUGH 2010 RAV4 VEHICLES. THE ACCELERATOR PEDAL CAN GET STUCK IN THE WIDE OPEN POSITION DUE TO ITS BEING… Remedy: THE REMEDY IS NOW AVAILABLE. THE SAFETY RECALL BEGAN EARLY APRIL 2011. THE REMEDY WILL INVOLVE MODIFICATION OR REPLACEMENT OF THE ACCELERATOR PEDAL AND REPLACEMENT OF ANY TOYOTA…

03V146000Fuel System, GasolineReported 14/04/2003

ON CERTAIN SPORT UTILITY VEHICLES EQUIPPED WITH V6 ENGINES, THE FUEL PULSATION DAMPER, LOCATED ON THE FUEL RAIL, MAY HAVE BEEN IMPROPERLY ASSEMBLED, CAUSING A DIAPHRAGM IN THE PULSATION DAMPER TO BE DAMAGED. IF THE… Remedy: DEALERS WILL REPLACE THE PULSATION DAMPER. OWNER NOTIFICATION BEGAN MAY 5, 2003. OWNERS WHO TAKE THEIR VEHICLES TO AN AUTHORIZED DEALER ON AN AGREED UPON SERVICE DATE AND DO NOT…

Technical service bulletins NHTSA · verified

Showing 5 of 249 bulletins on record with NHTSA.

BulletinDateComponentSummary
T-SB-0035-24 Rev22024-12-06StructureAcid rain results from rainwater or other airborne moisture that become acidic due to…
T-SB-0038-24 Rev22024-12-06StructureTo prevent brake rotor rust from forming during transportation and storage, wheel film…
T-SB-0039-24 Rev22024-12-06StructureThe condition known as acid rain is caused by airborne chemicals or particles in the…
T-SB-0061-23 Rev22024-12-05StructureToyota vehicles are currently protected with RapgardTM protective film designed to…
T-SB-0062-23 Rev22024-12-03StructureVehicles may occasionally be subjected to contamination by airborne iron particles shed…

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 4runner. 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 4runner V6 take?

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

Does the 2003 4runner have open recalls?

NHTSA lists 3 recall campaign(s) for this model year. Check your specific vehicle by VIN.

What gas mileage does the V6 get?

EPA figures are 16 city / 20 highway / 18 combined mpg.