MazdaMX-5 Miata2003Overview/mazda/mx-5-miata/2003/base/

2003 Mazda MX-5 Miata

Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 2003 MX-5 Miata.

Body PASSENGER CARTransmission Automatic 4-spd

The 2003 Mazda MX-5 Miata is a passenger car that retains the classic front-engine, rear-wheel-drive roadster layout, offered here with a 4-speed automatic transmission and EPA ratings of 20 city, 25 highway, and 22 combined mpg. With only 15 total owner complaints and a single recall—the top issue being in the Structure area—this model year stands in stark contrast to the model’s earlier reliability history, where the 1999 peak saw 75 complaints; the 2003 thus represents a notably stable point in the Miata’s evolution, benefiting from the lessons learned across the preceding decade.

Model year202520242023202220212003200220012000

Quick specs

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

EPA fuel economy20/25/22 mpgEPA · verified

Fitment & sizes

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

From the factory this vehicle uses OE oil filter B6Y114302A. 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.

Tail / brake / turnFUSEOEM · verified

OE service part numbers OEM · verified

Engine oil filterB6Y114302A
Engine air filterB6MW13Z40
Fuel filterBP4W13480
Spark plug000018BP01 alt 000018BP03
Battery0000800MX5WB
Front wiper bladesNC1067330
Serpentine beltB61P15907B alt B6BF18381
ThermostatBP6F15171A alt B62115173

Full specifications

Engine, drivetrain, dimensions and economy.

Engine & drivetrain NHTSA vPIC

TransmissionAutomatic 4-spd

Dimensions & weight NHTSA vPIC

Overall length155.9 in
Overall width66.1 in
Overall height48.4 in
Wheelbase89.4 in
Curb weight2350 lb
Track (front / rear)55.9 / 56.7 in
Weight distribution (front / rear)53/47

Ratings & economy EPA / vPIC

EPA city / highway / combined20 / 25 / 22 mpg
DrivetrainRear-Wheel Drive
Recommended fuelPremium Gasoline

Performance & power Independent road tests

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

Independent road tests for the MX-5 Miata of this era, listed by trim and engine — this page spans more than one engine, so no single horsepower figure is shown.

6.7–8.1 sec0–60 mph (tested)quickest 6.70 sec — 2004 Mazdaspeed
YearTrim / engine0–60¼ mileHPDrivetrain
2004Mazdaspeed 1.8L Turbo I-46.70 sec15.20 sec178 hpRWD
2004Mazdaspeed 1.8L Turbo I-47.10 sec15.40 sec178 hpRWD
2001Convertible 1.8L I-47.90 sec15.92 sec140 hpRWD
2001Convertible 1.8L I-48.10 sec16.30 sec140 hpRWD
199910th Anniversary Edition 1.8L I-47.40 sec15.60 sec140 hpRWD
199910th Anniversary Edition 1.8L I-47.50 sec15.80 sec140 hpRWD
199910th Anniversary Edition 1.8L I-47.60 sec15.90 sec140 hpRWD
199910th Anniversary Edition 1.8L I-47.80 sec16.00 sec140 hpRWD

Service quick specs OEM factory data

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

This engine GL-5 in the differential. The firing order is 1-3-4-2.

Lubricants & capacities

Differential Gear OilGL-5
Differential Gear Oil Capacity2.1 Pints
Power Steering FluidATF

Ignition

Cylinder Firing Order1-3-4-2
Spark Plug Gap0.040-0.043 in
Spark Plug Torque11.0-16.0 ft-lbs

Battery & A/C

RefrigerantR134a
Refrigerant Capacity0.88 lbs
Oil TypeND-9 Oil
Oil Capacity5.07 oz

Service checks

Engine Compression146-198 psi

Brakes

Wheel Application16 inch WHEELS / 15 inch WHEELS
Torque Caliper to Bracket58-65 ft-lbs / 26-28 ft-lbs / 37-50 ft-lbs
Torque to Knuckle37-50 ft-lbs / 66-86 ft-lbs
Wheel Application15 inch WHEELS / 16 inch WHEELS
Rotor Max Parallel Variation0.0006 in
Rotor Runout Limit0.002 in
Rotor Minimum Machining0.709 in / 0.787 in / 0.315 in
Rotor Discard at or Under0.708 in / 0.786 in / 0.314 in

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 at 45,000 mi. The big-interval services (at 45,000 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 miBody Latches, Locks & Hinges (inspect) · Body Lock Cylinders (lubricate) · Engine Oil (drain & refill) · Engine Oil Filter (replace) · Hood Latch (lubricate) · Tire & Wheel Assembly (rotate)
Every 15,000 miAir Conditioning System (inspect) · Engine Air Filter Element (inspect)
Every 30,000 miAccessory Drive Belt (inspect) · Axle Shaft Oil Seal (inspect) · Body Fasteners (torque) · Brake Line (inspect) · Brake System (inspect) · CV Joint Boot (inspect)
At 45,000 miEngine Coolant System (drain, flush & refill)
Every 60,000 miEmission Control System (inspect) · Engine Valves (inspect valve lash) · 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 provided year-by-year federal record spans 1990 through 2001 and shows a pattern of low complaints—ranging from 1 to 75 annually—with zero recalls and zero investigations across every listed year, and TSB counts ranging from 7 to 18. Because the record does not include 2003 or its adjacent model years, direct year-over-year comparison for the target year is not possible from this dataset. For 2003 specifically, the federal data records two complaints each in structure, power train, and exterior lighting, one unknown or other complaint, one crash complaint, and three fire complaints; the dataset does not specify recalls or investigations for this year. This leaves 2003 uncharted in the year-by-year arc, though its sparse complaint counts and diffuse categories mirror the low-incident trajectory seen in most years rather than the 1999 outlier. The three fire complaints represent the only notable concentration, though the data does not specify a root cause. Given the historically minimal recall burden through 2001 and the absence of systemic complaints in the 2003 data shown, this appears to be a sound year to buy from a federal-record standpoint, contingent on verifying the specific vehicle’s condition.

1
Open recalls
NHTSA campaigns
97
Service bulletins
Manufacturer communications
0
ODI investigations
Office of Defects Investigation
15
Owner complaints
1 involved a crash · 3 a fire
Owner complaints by model year NHTSA · this generation & adjacent

Owner complaints filed with NHTSA, by component

All 15 complaints on record, top 8 components.

Structure2
Power Train2
Exterior Lighting2
Unknown Or Other1
Steering,Air Bags1
Suspension1
Tires1
Steering,Fuel System, Gasoline,Electrical System,Wheels1

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 97 bulletins on record with NHTSA.

BulletinDateComponentSummary
SA-029-262026-04-21Power TrainThis Service Alert supersedes the previously issued SA listed below: The changes are…
07-004-25a2025-12-10Unknown Or OtherA musty/mildew type odor may come from the vents when the air conditioning (A/C) system…
07-004-252025-04-25Unknown Or OtherA musty/mildew type odor may come from the vents when the air conditioning (A/C) system…
09-038-242024-08-08Electrical SystemIn accordance with Federal regulations, follow the procedure listed below when replacing…
SA-011-24b2024-07-29Unknown Or OtherMazda has developed factory recommended scheduled maintenance services that support all…

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 MX-5 Miata. 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

Does the 2003 MX-5 Miata have open recalls?

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

What gas mileage does the MX-5 Miata get?

EPA figures are 20 city / 25 highway / 22 combined mpg.