LexusRX3002003Overview/lexus/rx300/2003/base/

2003 Lexus RX300

Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 2003 RX300.

Body SUVTransmission Automatic 4-spd

The 2003 Lexus RX300 is an SUV equipped with a 4-speed automatic transmission and an engine requiring 5 quarts of 10W-30 or 5W-30 API oil, delivering EPA fuel economy of 17 city, 21 highway, and 18 combined mpg. Within the model's 1998–2003 complaint history, this final year records just 30 total owner complaints — a steep decline from the 1999 high of 224 and only modestly above the 1998 low of 6 — with Vehicle Speed Control emerging as the top complaint area alongside three recalls on record. For researchers, that downward trajectory indicates Lexus progressively resolved earlier issues across the RX300's run, positioning the 2003 as one of the more settled model years in the generation, though the speed-control complaints and recalls mean it is not without caveats.

Model year20032002200120001999

Quick specs

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

Engine oil capacity5 qtOEM · verified
Engine oil type10W-30 / 5W-30 APIOEM · verified
Lug nut torque76 ft-lbsOEM · verified
EPA fuel economy17/21/18 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 90915YZZD1. 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 / turnHEADOEM · verified

OE service part numbers OEM · verified

Engine oil filter90915YZZD1
Engine air filter1780103010
Fuel filter233000A020 alt 2321746090
Spark plug9008091180
Front wiper blades8522212750 alt 8521236030
Serpentine belt9936631040 alt 9008091212
Thermostat90916A3003 alt 1632562010
Cabin air filter871394802083

Full specifications

Engine, drivetrain, dimensions and economy.

Engine & drivetrain NHTSA vPIC

TransmissionAutomatic 4-spd

Ratings & economy EPA / vPIC

EPA city / highway / combined17 / 21 / 18 mpg
DrivetrainFront-Wheel Drive
Passenger volume104 cu ft
Cargo volume32 cu ft
Recommended fuelRegular Gasoline

Service quick specs OEM factory data

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

This engine holds 5 qt of 10W-30 / 5W-30 API engine oil, GL-5 · 80W-90 in the differential. Torque lug nuts to 76 ft-lbs, the oil drain plug to 29.0-30.0 ft-lbs. The firing order is 1-2-3-4-5-6.

Lubricants & capacities

Differential Gear OilGL-5 · 80W-90
Differential Gear Oil Capacity1.8 Pints
Engine Oil10W-30 · API · 5W-30
Engine Oil Capacity5 qt
Transfer Case FluidGL-5 · 80W-90
Transfer Case Fluid Capacity1.8 Pints

Engine torques

Camshaft Bearing/Carrier Cap Bolts or Studs12 ft-lbs
Crankshaft Pulley and/or Damper Bolts243 ft-lbs
Engine Flywheel Bolts61 ft-lbs
Engine Oil Pan Drain Plug29.0-30.0 ft-lbs

Chassis torques

Lug Nuts76 ft-lbs
Transfer Case Fill Plug36.0 ft-lbs
Transfer Case Drain Plug36.0 ft-lbs
Front Wheel Hub217 ft-lbs
Rear Wheel Hub159 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
Spark Plug Gap0.039-0.0.043 in
Spark Plug Torque13.0 ft-lbs

Battery & A/C

RefrigerantR134a
Refrigerant Capacity1.21-1.43 lbs
Oil GroupPAG
Oil Type46
Oil Capacity6.91 oz
Standard BCI Group Number24F
Standard BCI Cranking Performance585 cca

Service checks

Pressure Test17 psi
Radiator Cap Pressure Relief11-15 psi
Thermostat Opening Temperature176-183 °F
Injector Primary Resistance13.4-14.2 @ 68 degreesF ohms
Engine Compression142-213 PSI. 14 maximum variation PSI.
Engine Oil Pressure4.3 psi @ Idle, 43-78 psi @ 3000 rpm psi
Intake Valve Lash0.006-0.010 in
Exhaust Valve Lash0.010-0.014 in

Brakes

Torque Caliper to Bracket25 ft-lbs / 20 ft-lbs
Torque to Knuckle79 ft-lbs / 34 ft-lbs
Minimum Pad ThicknessFront: 0.039; Rear: 0.040 in
Rotor Runout Limit0.002 in / 0.0059 in
Rotor Nominal Thickness From1.102 in / 0.394 in
Rotor Nominal Thickness To1.102 in / 0.394 in
Rotor Discard at or Under1.024 in / 0.354 in

Multi-step torque procedures OEM · verified

Connecting Rod (Large End) Bearings — tightening sequence 1 stages
118 ft. lbs., Step 2: 9018 ft. lbs
Main Bearings — tightening sequence 1 stages
116 ft. lbs., Step 2: 9016 ft. lbs
Oil Pump to Cylinder BLock Bolts/Studs — tightening sequence 1 stages
110MM Bolts14 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; spark plugs at 120,000 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.

Every 7,500 miEngine Oil (drain & refill) · Engine Oil Filter (replace) · Tire & Wheel Assembly (rotate) · Universal Vehicle Operation (road test)
Every 15,000 miAccessory Drive Belt (inspect) · Brake Line (inspect) · Brake System (inspect) · CV Joint Boot (inspect) · Differential (inspect fluid level) · Driveshaft Flange Yoke (torque)
Every 22,500 miCabin Air Filter (replace)
Every 30,000 miBrake Hydraulic System (drain, refill & bleed) · 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 miDrive Axle Assembly (drain & refill) · Engine Valves (inspect valve lash)
Every 90,000 miTiming Belt (replace)
At 120,000 miSpark Plugs (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.

Across the RX300 generation, federal complaints exhibit a pronounced downward trend, dropping dramatically from a peak of 224 in 1999 to just 30 in the 2003 model year, while recalls similarly declined from 7 to 3. As the final year of the generation, the 2003 model sits at the very bottom of this downward arc, implying that manufacturer running changes successfully mitigated earlier, more prevalent issues. For the 2003 model specifically, the 30 complaints primarily target Vehicle Speed Control (5), Air Bags (4), and Power Train (4), though the data does not specify the root causes for these categories. The model also reports zero fire incidents and only 6 crash complaints. Given its position as the most refined year with the lowest complaint and recall volume in the generation, the 2003 RX300 is an excellent choice for a used vehicle purchase.

3
Open recalls
NHTSA campaigns
67
Service bulletins
Manufacturer communications
0
ODI investigations
Office of Defects Investigation
30
Owner complaints
6 involved a crash · 0 a fire
NHTSA crash-test rating federal NCAP · out of 5 stars
Rollover★★★★★
Owner complaints by model year NHTSA · this generation & adjacent

Owner complaints filed with NHTSA, by component

All 30 complaints on record, top 8 components.

Vehicle Speed Control5
Air Bags4
Power Train4
Engine & Engine Cooling3
Unknown Or Other2
Visibility2
Visibility,Electronic Stability Control (Esc),Engine1
Seat Belts1

Source: NHTSA Office of Defects Investigation complaint database.

Recalls NHTSA · verified

Showing 2 of 3 campaigns on record for this vehicle.

08E020000Visibility:Glass, Side/RearReported 06/03/2008

POLYMER PROCESS DEVELOPMENT IS RECALLING 931 UNITS OF BACK GLASS, P/NO. FB20415ZPY, SOLD AS REPLACEMENT EQUIPMENT FOR USE ON 1999-2004 LEXUS RX300 VEHICLES. THE GLASS FAILS TO CONFORM TO THE AUTOMOTIVE GLAZING MATERIAL… Remedy: POLYMER WILL NOTIFY OWNERS AND REPLACE THE AFFECTED GLASS FREE OF CHARGE. THE RECALL BEGAN ON APRIL 18, 2008. OWNERS MAY CONTACT POLYMER TOLL-FREE AT 800-510-9879.

06E049000Exterior LightingReported 24/05/2006

CERTAIN CK MOTORSPORTS COMBINATION HEADLIGHTS, CLEAR CORNER, BUMPER, AND SIDE MARKER LIGHTS SOLD AS REPLACEMENT LAMPS FOR USE ON THE PASSENGER VEHICLES LISTED ABOVE. SOME COMBINATION LAMPS THAT ARE NOT EQUIPPED WITH… Remedy: CK MOTORSPORT WILL NOTIFY OWNERS AND REPLACE THE NONCOMPLIANT LAMPS FREE OF CHARGE. THE RECALL BEGAN ON JULY 1, 2006. OWNERS MAY CONTACT CK MOTORSPORT AT 1-909-610-7211.

Technical service bulletins NHTSA · verified

Showing 5 of 67 bulletins on record with NHTSA.

BulletinDateComponentSummary
L-SB-0020-242024-04-19StructureVehicles may occasionally be subjected to contamination by airborne iron particles shed…
L-SB-0021-242024-04-19StructureLexus vehicles are currently protected with RapgardTM protective film designed to protect…
L-SB-0022-242024-04-19StructureAcid rain results from rainwater or other airborne moisture that become acidic due to…
L-SB-0024-242024-04-19StructureThe condition known as acid rain is caused by airborne chemicals or particles in the…
L-SB-0020-242024-04-19StructureVehicles 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 RX300. 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 RX300 take?

5 qt of ABOVE 0 F: 10W-30 API, BELOW 100 F: 5W-30 API, per the factory manual.

Does the 2003 RX300 have open recalls?

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

What gas mileage does the RX300 get?

EPA figures are 17 city / 21 highway / 18 combined mpg.