really awful
Crashes / Fires:
1 / 1
Injuries / Deaths:
0 / 0
Average Mileage:
66,075 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2004 Mazda MAZDA6 engine problems

engine problem

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2004 Mazda MAZDA6 Owner Comments

problem #7

Jun 062013


  • 127,643 miles


Constant overheating problems. Changed everything from hoses to radiator, thermostat and gasket but it still comes on after a while. Spent sooo much money on this and the other day smoke erupted from car when driving and got in accident. Former owner had same problem.

- Lanham, MD, USA

problem #6

Aug 022011

MAZDA6 6-cyl

  • miles
Transmission problems....it wont reverse, it's making scary noises and it's jerking none stop. Mechanic said I have to get it rebuild, I had over 20 quotes for a price to get it rebuild but I cant afford it..please recall the 3.0 automatic transmission...I looked on the internet and I saw that hundreds and hundreds of people are complaining about the same problem with Mazda 6 2004 transmissions and we cant afford it. The lowest price was starting at 1500 not including labor. Im a single mom with two toddlers, im working and I cant even get it fixed.

- Ocoee, FL, USA

problem #5

Jun 012011


  • 81,500 miles
Engine will shut off without warning at any speed. I researched the issue and found that there are a large number of complaints regarding the exact same symptoms with the 2003-2005 Mazda 6. Mazda even released a service bulletin: 01-016/06 in 2006 regarding a bad throttle body with aa, ab, or ba markings. Sure enough after removing the throttle body, mine had the aa markings. From the amount of online complaints and the fact that a service bulletin was released, this is not an isolated issue. This is a huge safety concern and should be a safety recall. To top it off, currently Mazda has an issue with replacement throttle body's that will cause the car to jerk and stall at anytime. They have admitted that the current new stock of throttle bodies will not work with my vehicle. This will cause people to keep driving with a bad throttle body since there is no replacement.

- Bristow, VA, USA

problem #4

Apr 012011


  • 61,580 miles


Engine is throwing a rod, needs new engine, no check engine light or other warning lights present to alert to impending failure.

- Tonawanda, NY, USA

problem #3

Sep 162010


  • 85,000 miles
The contact owns a 2004 Mazda, Mazda6. While the vehicle was parked, the contact smelled burnt oil. The oil light never illuminated but the next morning when he started the vehicle, the contact noticed that the engine was knocking. He added oil to the engine and had the vehicle towed to an authorized dealer. The dealer stated that the cam had slipped which caused extensive damage to the engine. The vehicle had not been repaired. The dealer was speaking with warranty personnel and the manufacturer at the time of the complaint. The current and failure mileages were approximately 85,000.

- Sacramento, CA, USA

problem #2

Jul 082009


  • 87,000 miles
2004, 5speed Mazda6 catches fire and burns to a crisp. Getting onto a highway a loud "pop" was heard then there was smoke-popped the hood alot more smoke checked under the car for leaks saw orange glow-10 seconds later the car was up in flames.

- Haskell, NJ, USA

problem #1

Aug 272005

MAZDA6 4-cyl

  • Automatic transmission
  • 19,800 miles
Aug 27 engine noise, Aug 29 Mazda diagnosed internal engine damage. 2004 19,000 miles under warranty-Mazda wont repair, says the oil change of 7-23 was not performed correctly. $8000-$9000 to fix engine, nothing done at this time, trying to find an attorney.

- Houston, TX, USA

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