The 2004 Mazda Mazda6 has no open NHTSA recalls. Owners report 7 recurring issue clusters, led by “Driver door latch and lock failure.” Mazda's Skyactiv engines use unusually high compression ratios (13:1 to 16:1) and require strict adherence to oil intervals — extending oil life on a Skyactiv engine accelerates carbon buildup on intake valves. Mazda's published Schedule 1 (severe) covers most US driving conditions.
No open recalls on file. NHTSA lists no unrepaired safety recalls for this year, make and model. A recall can be issued at any time, and a specific car can still have one open — check yours by VIN at nhtsa.gov/recalls.
What drivers and federal regulators have officially reported about the 2004 Mazda Mazda6.
STRUCTURE, LATCHES/LOCKS/LINKAGES
16 NHTSA complaints · 2005-04 → 2016-07
“DRIVER DOOR WILL NOT OPEN FROM INSIDE OR OUT, THIS IS VERY DANGEROUS BECAUSE IF IM IN AN ACCIDENT HOW WILL I GET OUT?”
“AFTER PARKING THE VEHICLE, THE FRONT DRIVER SIDE DOOR COULD NOT BE OPENED AND TRAPPED THE DRIVER INSIDE”
“SHE FOUND SHE COULD NOT OPEN THE DRIVER'S SIDE DOOR BY ANY MEANS AT ALL”
POWER TRAIN
9 NHTSA complaints · 2005-10 → 2024-03
“Very hard shifts from 1st to 3rd gear it's a automatic transmission it's getting worse it will do it at random times”
“SHIFT SHOCK WHEN THE AUTOMATIC TRANSMISSION CHANGES GEARS. THIS IS AN INTERMITTENT, ONGOING OCCURRENCE”
“SOMETIMES TRANSMISSION WILL DOWNSHIFT VERY, VERY HARD”
ENGINE AND ENGINE COOLING
9 NHTSA complaints · 2009-04 → 2016-03
“ENGINE IS THROWING A ROD, NEEDS NEW ENGINE, NO CHECK ENGINE LIGHT OR OTHER WARNING LIGHTS PRESENT TO ALERT TO IMPENDING FAILURE”
“PRE CATALYTIC CONVERTER FAILED, DESTROYING MY V6 ENGINE”
“THE DEALER STATED THAT THE CAM HAD SLIPPED WHICH CAUSED EXTENSIVE DAMAGE TO THE ENGINE”
EXTERIOR LIGHTING
5 NHTSA complaints · 2007-01 → 2023-04
“The contact replaced the bulbs, but the failure persisted”
“THE HEADLIGHT BULBS FAILED SIMULTANEOUSLY. THE DEALER REPLACED THE BULBS FOUR TIMES, BUT THE FAILURE WAS NOT CORRECTED”
“I HAVE BEEN HAVING TROUBLE WITH THE HEADLIGHTS AND FOG LIGHTS ON MY 2004 MAZDA 6S”
AIR BAGS
48 NHTSA complaints · 2015-02 → 2026-08
“TAKATA RECALL: THREE MONTHS WITH NO REMEDY IN SITE. BEEN UNABLE TO USE CAR AS DESIGNED. WHAT IS STATUS FOR FIX? WHEN CAN A USE THE PASSENGER SEAT?”
“I RECEIVED A RECALL FOR AIRBAGS AND MAZDA CONTINUES TO TELL ME THEY DON'T HAVE THE PARTS AND THEY DON'T HAVE ANY IDEA WHEN THEY WILL GET PARTS FOR MY CAR”
“I RECEIVED A RECALL NOTICE OVER 6 MONTHS AGO, BUT THE PART ISN'T YET AVAILABLE FOR REPLACEMENT”
FUEL SYSTEM, GASOLINE
13 NHTSA complaints · 2005-03 → 2018-12
“ENGINE FAILED WHILE DRIVING BECAUSE OF A PROBLEM WITH THE THROTTLE BODY. THERE WAS NO WARNING”
“MY CAR FREQUENTLY STALLS ON THE HIGHWAY AND I HAVE TO EITHER PULL OFF TO THE SIDE OF THE HIGHWAY TO RESTART IT OR PUT IT IN NEUTRAL AND RESTART IT WHILE COASTING ON THE HIGHWAY”
“WHEN I STEPPED ON THE GAS, I HAD A LOSS OF POWER THAT ALMOST CAUSED AN ACCIDENT”
SERVICE BRAKES, HYDRAULIC
4 NHTSA complaints · 2006-02 → 2007-11
“BRAKES SUDDENLY FAILED WHILE DRIVING BARELY AVOIDING A SERIOUS COLLISION”
“THE METAL BRAKE LINES WERE RUBBING AGAINST THE CV BOOTS”
“FRONT BRAKE DISCS SEVERE VIBRATION ON STEERING WHEN APPLYING BRAKES!”
Issues on other model years
Source: NHTSA Office of Defects Investigation (ODI). Complaint data refreshed Sep 20, 2026. Investigation data refreshed Sep 20, 2026.
We display NHTSA's record with attribution; we don't editorialize on what these complaints mean for any specific vehicle.
Critical for safety and preventing major damage
Replace 0W-20 full-synthetic oil every 5,000 miles under Schedule 1. Schedule 2 (highway-only): 7,500 miles. Turbo engines: 5,000 miles regardless of schedule.
Estimated cost — typical U.S. ranges
Dealer
~$120–$160
Shop
~$85–$115
DIY
~$25–$55
Full synthetic costs more than conventional. 5-quart 0W-20 + filter is the typical bill.
Rotate tires every 7,500 miles; every 5,000 on AWD models, where the front-biased coupling wears tires unevenly.
Estimated cost — typical U.S. ranges
Dealer
~$85
Shop
~$60
DIY
Free
Often free at the shop where you bought the tires — worth asking before paying.
Inspect brake pads, rotors, and parking brake at every oil change. Front pads typically last 35,000-50,000 miles.
Estimated cost — typical U.S. ranges
Dealer
~$85
Shop
~$60
DIY
Free
Most shops do this free as a courtesy with any service. Don't pay separately if you can avoid it.
Replace DOT 3 brake fluid every 30,000 miles or 36 months.
Estimated cost — typical U.S. ranges
Dealer
~$180–$200
Shop
~$125–$140
DIY
~$10–$25
DOT 3 or 4 — match the cap. Vacuum bleeders make this a one-person DIY.
Keeps your vehicle running smoothly and efficiently
Replace engine air filter every 30,000 miles. Skyactiv-G direct injection is sensitive to airflow restriction — inspect at every oil change.
Estimated cost — typical U.S. ranges
Dealer
~$60–$95
Shop
~$45–$70
DIY
~$15–$40
5-minute job on most cars; the airbox lid usually has clips, no tools needed.
Replace ATF every 60,000 miles severe / 100,000 normal. Use Mazda FZ ATF — substitutes cause harsh 1-2 shifts and torque converter shudder.
Estimated cost — typical U.S. ranges
Dealer
~$330–$500
Shop
~$235–$355
DIY
~$60–$180
Some sealed transmissions have no dipstick — fill is precise and best left to a shop. Many drivers can still DIY drain-and-fill.
Iridium spark plugs every 60,000 miles on Skyactiv-G 2.0L and 2.5L; 45,000 miles on the 2.5L Turbo.
Estimated cost — typical U.S. ranges
Dealer
~$285–$390
Shop
~$200–$275
DIY
~$25–$100
Iridium plugs cost more but last 100k+ miles. V6/V8 access varies wildly — some are tough.
Mazda FL-22 (yellow): first change at 120,000 miles or 10 years, then every 60,000. Do not substitute — silicate-free formula prevents water pump damage on Skyactiv engines.
Estimated cost — typical U.S. ranges
Dealer
~$285–$330
Shop
~$200–$235
DIY
~$25–$60
Use the manufacturer-specified coolant — wrong color/chemistry can damage the cooling system.
On AWD models, replace transfer case fluid and rear differential fluid every 60,000 miles.
Estimated cost — typical U.S. ranges
Dealer
~$105–$140
Shop
~$75–$100
DIY
~$15–$40
AWD/4WD vehicles only. Easy drain-and-fill on most platforms.
Extends the life of your vehicle and improves comfort
Replace cabin air filter every 15,000 miles. On most models it sits behind the glove box.
Estimated cost — typical U.S. ranges
Dealer
~$60–$95
Shop
~$45–$70
DIY
~$15–$40
Usually behind the glovebox. Shops charge labor for a 10-minute job — easy DIY win.
Occupant deaths in fatal crashes (FARS)
144 crashes 1990–2024
How the 144 occupant deaths break down
101
driver deaths
43
passenger deaths
144
occupant deaths
Crash years covered: 1990–2024 This model year first appears in 2004 crashes. Older models have had more years on the road to appear in these crashes, so a higher count here does not by itself mean a vehicle is less safe.
FARS counts every occupant death in a fatal crash, whatever the cause — it does not mean the vehicle was at fault or defective. Counts are not adjusted for how many of each vehicle are on the road. How to read this number
FARS 2024 data is an annual report file. NHTSA revises these records when the final file is published, so this count can change.
Every vehicle has exactly one driver seat, so driver deaths line up fairly when you compare one model to another. Occupant deaths include passengers, so a three row SUV can show a higher number than a two seat car simply because it carries more people.
Both figures are plain counts, not rates. A rate would need to know how many of each vehicle are on the road, and that registration data is not public, so we do not publish rates or scores of any kind.
IIHS publishes driver death rates using this same driver only idea, paired with a registered vehicle years denominator we do not have. Their rates and these counts answer different questions, so do not read either number here as a safety rating.
Owner-reported problem signals
Separate from the federal fatality data above: complaints owners filed with NHTSA about this year and model. These are reports of problems, unverified, and are counted here only as signals.
17
complaints mentioning a crash
5
complaints mentioning a fire
Typical U.S. ranges. Actual quotes vary by shop, parts choice, and vehicle condition.
How we estimate: Dealer = OEM parts × 1.4 + labor × $165/hr. Shop = parts + labor × $115/hr. DIY = parts only.
This maintenance schedule for the 2004 Mazda Mazda6 reflects Mazda's published service intervals. Your actual service needs may vary based on driving conditions, climate, and vehicle usage. Always consult your owner's manual for model-specific recommendations.