MazdaMX-5 Miata/Mazdaspeed Miata2004Overview/mazda/mx-5-miata-mazdaspeed-miata/2004/base/

2004 Mazda MX-5 Miata/Mazdaspeed Miata

Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 2004 MX-5 Miata/Mazdaspeed Miata.

Body PASSENGER CARTransmission Automatic 4-spd

The 2004 Mazda MX‑5 Miata, classified as a passenger car, retains the lightweight, two‑seat roadster platform that defines the model’s enduring appeal, pairing a modestly tuned engine with an automatic 4‑speed transmission and delivering an EPA rating of 20 mpg city, 26 mpg highway, and 22 mpg combined. Its chassis balance and modest powertrain are complemented by a relatively low total of 33 owner complaints, the majority of which center on engine and cooling issues, while the model records zero recalls for the year. Positioned near the midpoint of the early‑generation Miata’s production run, the 2004 iteration is generally regarded as a reliable point in the model’s history, offering solid durability for researchers examining long‑term dependability trends.

Model year20052004

Quick specs

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

EPA fuel economy20/26/22 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 BP8J18110
Battery0000800MX5WB
Front wiper bladesNC1067330
Serpentine beltB6BF18381 alt B61P15907B
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 / 26 / 22 mpg
DrivetrainRear-Wheel Drive
Recommended fuelPremium Gasoline

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

Automatic Transmission FluidATF
Automatic Transmission Fluid Capacity7.8
Differential Gear OilGL-5
Differential Gear Oil Capacity2.1 Pints
Differential Gear OilGL-5
Differential Gear Oil Capacity2.1 Pints
Manual Transmission Fluid75W-90 · GL-4
Manual Transmission Fluid Capacity4

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 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 miBody Lock Cylinders (lubricate) · Engine Oil (drain & refill) · Engine Oil Filter (replace) · Hood Latch (lubricate) · Tire & Wheel Assembly (rotate)
At 15,000 miEngine Air Filter Element (clean)
Every 15,000 miBrake System (inspect) · Engine Air Filter Element (inspect)
Every 22,500 miEngine Air Filter Element (clean)
Every 30,000 miAccessory Drive Belt (inspect) · Axle Shaft Oil Seal (inspect) · Brake Line (inspect) · CV Joint Boot (inspect) · Engine Coolant System (drain, flush & refill) · Engine Coolant System (leak inspection)
Every 45,000 miExhaust System Heat Shield (inspect)
At 60,000 miEngine Air Filter Element (clean) · Engine Coolant System (drain, flush & refill)
Every 60,000 miDrive Axle Assembly (drain & refill) · Emission 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.

Owner complaints about the 2004 Mazda MX-5 Miata/Mazdaspeed Miata dominate in one area — the engine & engine cooling, 14 of 33 reports (42%), well ahead of the next concern. NHTSA has issued no recalls for this vehicle, so these are owner-reported concerns only. 6 of the reports describe a crash and 0 a fire — a small share of the total, but worth weighing against the engine & engine cooling pattern above. These are tallies of what owners actually reported to the federal government, not an editorial score — and higher-selling models naturally rack up more reports.

0
Open recalls
NHTSA campaigns
108
Service bulletins
Manufacturer communications
0
ODI investigations
Office of Defects Investigation
33
Owner complaints
6 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 33 complaints on record, top 8 components.

Engine & Engine Cooling14
Fuel System, Gasoline5
Air Bags,Equipment2
Seat Belts2
Electrical System2
Structure1
Engine & Engine Cooling,Power Train,Unknown Or Other1
Tires1

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 108 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…
SA-036-252025-08-14Unknown Or OtherWhen replacing the SiriusXM satellite radio unit, a call must be made to inform SiriusXM…
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…

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

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VIN
Decode a VIN to confirm the transmission and build data for a specific MX-5 Miata/Mazdaspeed 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 2004 MX-5 Miata/Mazdaspeed Miata have open recalls?

NHTSA lists 0 recall campaign(s) for this model year. Check your specific vehicle by VIN.

What gas mileage does the MX-5 Miata/Mazdaspeed Miata get?

EPA figures are 20 city / 26 highway / 22 combined mpg.