LexusIS3002003Overview/lexus/is300/2003/base/

2003 Lexus IS300

Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 2003 IS300.

Body PASSENGER CARTransmission Automatic (S5)

Classified as a passenger car, the 2003 Lexus IS300 is equipped with an Automatic (S5) transmission and delivers EPA fuel economy ratings of 16/22/18 mpg while requiring 5.7 qt of 5W-30 API engine oil. Specific ownership data records 34 total owner complaints for this model year with Structure identified as the top complaint area, accompanied by a single recall. When viewed against the model complaint history covering 2001 through 2019, the 2003 figure remains lower than the highest count of 45 complaints recorded in 2002 but exceeds the lowest count of 2 in 2017, positioning it between the model's historical extremes.

Model year202520242023202220212020201920182003

Quick specs

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

Engine oil capacity5.7 qtOEM · verified
Engine oil type5W-30 APIOEM · verified
Lug nut torque76 ft-lbsOEM · verified
EPA fuel economy16/22/18 mpgEPA · verified

Fitment & sizes

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

From the factory this vehicle uses a BCI 24 · 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 24 · 585 CCAOEM · verified
Tail / brake / turn6OEM · verified
Tire size225-45R17OEM · verified
Wheel / rim7.5-JJ inOEM · verified

OE service part numbers OEM · verified

Engine oil filter90915YZZD1
Engine air filter1780146080
Fuel filter233000A020 alt 2321746090
Spark plug9091901219
Front wiper blades8522248040 alt 8521253061
Serpentine belt99366H1930
Thermostat9091603093 alt 1632562010
Cabin air filter871394802083

Full specifications

Engine, drivetrain, dimensions and economy.

Engine & drivetrain NHTSA vPIC

TransmissionAutomatic (S5)

Ratings & economy EPA / vPIC

EPA city / highway / combined16 / 22 / 18 mpg
DrivetrainRear-Wheel Drive
Passenger volume89 cu ft
Cargo volume10 cu ft
Recommended fuelPremium Gasoline

Service quick specs OEM factory data

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

This engine holds 5.7 qt of 5W-30 API engine oil, 80W-90 · GL-5 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 1-5-3-6-2-4.

Lubricants & capacities

Differential Gear Oil80W-90 · GL-5
Differential Gear Oil CapacityLimited Slip Axles Require Gl-5 For Limited Slip Axles
Engine Oil5W-30 · API
Engine Oil Capacity5.7 qt

Engine torques

Camshaft Bearing/Carrier Cap Bolts or Studs14 ft-lbs
Crankshaft Pulley and/or Damper Bolts243 ft-lbs
Engine Oil Pan Drain Plug29.0-30.0 ft-lbs
Oil Pump to Cylinder BLock Bolts/Studs15 ft-lbs

Chassis torques

Lug Nuts76 ft-lbs
Front Wheel Hub108 ft-lbs
Rear Wheel Hub213 ft-lbs

Ignition

Cylinder Firing Order1-5-3-6-2-4
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
RefrigerantR134a
Refrigerant Capacity1.32 lbs
Oil TypeND 8 oil
Standard BCI Group Number24

Service checks

Injector Primary Resistance13.4-14.2 @ 68 degreesF ohms
Engine Compression145-218. 14 maximum variation PSI.
Engine Oil Pressure7 psi @ Idle, 47 psi @ 3000 rpm psi

Brakes

Torque Caliper to Bracket87 ft-lbs
Torque to Knuckle76 ft-lbs / 77 ft-lbs
Minimum Pad ThicknessFront: 0.039; Rear: 0.040 in
Rotor Runout Limit0.002 in
Rotor Nominal Thickness From1.26 in / 0.472 in
Rotor Nominal Thickness To1.26 in / 0.472 in
Rotor Discard at or Under1.181 in / 0.413 in

Multi-step torque procedures OEM · verified

Connecting Rod (Large End) Bearings — tightening sequence 1 stages
122 ft. lbs., Step 2: 9022 ft. lbs
Main Bearings — tightening sequence 1 stages
133 ft. lbs., Step 2: 9033 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 every 60,000 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)
Every 15,000 miAccessory Drive Belt (inspect) · Axle Shaft Oil Seal (inspect) · Body Latches, Locks & Hinges (inspect) · Brake System (inspect) · CV Joint Boot (inspect) · Cabin Air Filter (replace)
Every 30,000 miBrake Hydraulic System (drain, refill & bleed) · Engine Air Filter Element (replace) · Engine Coolant System (drain, flush & refill) · 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) · Fuel Evaporative Canister (inspect) · Spark Plugs (replace)
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 Lexus IS300 occupies a mid-cycle position within its generation, showing a modest decline in complaints (34) compared to the 2002 peak (45) but remaining slightly elevated relative to the 2004–2005 models. Recall activity holds steady at one per year from 2002 onward, with no investigations opened, suggesting consistent but not escalating safety concerns. The 2003 model’s top complaint areas—structure (10) and air bags (6)—mirror broader trends seen in adjacent years, while crash-related reports (10) and a single fire complaint align with the generation’s typical profile. Notably, the drop in Technical Service Bulletins (TSBs) from 77 in 2002 to 68 in 2003 implies incremental refinements rather than a systemic overhaul. This year avoids the early-build teething issues of 2001–2002 and precedes the further reliability improvements seen in 2004–2005. **Takeaway: the 2003 IS300 is a sound choice within its generation, offering a balance of maturity and proven durability without the higher complaint rates of its immediate predecessors.**

1
Open recalls
NHTSA campaigns
68
Service bulletins
Manufacturer communications
0
ODI investigations
Office of Defects Investigation
34
Owner complaints
10 involved a crash · 1 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 34 complaints on record, top 8 components.

Structure10
Air Bags6
Unknown Or Other3
Suspension2
Steering,Service Brakes,Engine1
Power Train,Service Brakes,Engine1
Service Brakes1
Unknown Or Other,Visibility/Wiper1

Source: NHTSA Office of Defects Investigation complaint database.

Recalls NHTSA · verified

No recall campaigns on record with NHTSA for this vehicle as of the last data refresh.

Technical service bulletins NHTSA · verified

Showing 5 of 68 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 IS300. 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 IS300 take?

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

Does the 2003 IS300 have open recalls?

NHTSA lists 1 recall campaign(s) for this model year. Check your specific vehicle by VIN.

What gas mileage does the IS300 get?

EPA figures are 16 city / 22 highway / 18 combined mpg.