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really awful
Crashes / Fires:
1 / 3
Injuries / Deaths:
0 / 0
Average Mileage:
35,133 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 RX-8 engine problems

engine problem

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2004 Mazda RX-8 Owner Comments (Page 1 of 3)

problem #46

Mar 262014


  • 110,000 miles


Rusted oil cooler lines and fittings on my RX8 driven in Ohio where road salting is prevalent in snow months. Filing this complaint since there is a recall issued for my same model year in Canada (special program 76) for this exact issue due to snow and salt. Modified lines are available to address issue but Mazda is not extending recall coverage to U.S. repair cost at dealer above $1K.

- Dublin, OH, USA

problem #45

Mar 302012


  • 139,000 miles
The contact owns a 2004 Mazda Rx-8. the contact was driving 5-10 mph when the engine stalled with the illumination of the engine coolant warning light. The vehicle was later restarted and taken to the dealer and a private mechanic. The diagnosis from both was that the engine was flooded and needed to be replaced. The manufacturer was not contacted. The failure and the current mileage was 139,000.

- Roxboro, NC, USA

problem #44

Nov 082011


  • miles
The car was taken to the dealership due to an engine recall, after the engine was replaced under warranty the dealer informed me of large oil leaks. Leaks are visible and are covering parts of the wheels and joints with oil. Mazda has admitted to this defect in Canada (field action number 142-36) and are providing Canadian customers with a recall on this faulty and dangerous part but us customers have yet to receive such treatment. My car is a 2004 model and it should not have such issues. This is a hazard to both my safety and the safety of others on the road due to the amounts of oil that the car is leaking due to poor engineering and bad design. The Mazda dealerships are charging customer an upward of 1,600 dollars to repair this issue which should not be an issue to begin with if this car was designed in a reliable way.

- Elmont, NY, USA

problem #43

Oct 052004


  • 28,000 miles


Vehicle was bought new,2004. I have every oil change, every 2,900-3,000 miles and vehicle is perfectly maintained by the dealership ( harrelson Mazda -charlotte, nc ). once 30,000 miles were put on the vehicle, engine began to fail ( stopped at red lights, stopped while on the highway, etc.). after about 5 return visits to the dealership technicians, my engine was finally 'replaced' under warranty. Now my new engine has failed again at about 40,000 miles for the same reason as originally: Mazda specifically advises 10W-20 oil in this vehicle. But this is only to satisfy U.S. epa standards. Everywhere else in the world, Mazda strictly advises 10W-30 oil, because anything less will allow engine to overheat and fail. I was never warned this. I was never advised this. I serviced vehicle by every recommendation of Mazda, the owners manual, and my Mazda authorized dealership/technicians. My safety has been placed in jeopardy, solely at the fault of Mazda, for not notifying buyers that the engine had incorrect maintenance specifications, etc. Feel free to contact me anytime for further information, receipts of service, maintenance, and technician testimony. [xxx] information redacted pursuant to the Freedom Of Information Act (FOIA), 5 U.S.C. 552(B)(6).

- Charlotte, NC, USA

problem #42

Aug 182011


  • 149,000 miles
The drivers and passengers side oil cooler line connectors are corroded so badly at 7 years of age that it's literally spewing oil whilst the car is running. I've driven cars that were 15+ years old with no such issues. Not only is this a mechanical concern, but it coats the tires in oil, and leaves traction on them almost nil. Mazda Canada has a recall for this exact problem, yet, Mazda usa has done nothing, except for quote people anywhere from 1800-2100 dollars to have these lines replaced. I think it's a complete disgrace to an otherwise very reliable car.

- Morrow, OH, USA

problem #41

Apr 132011


  • 40,000 miles
Engine failure, loss of power, multiple episodes.

- Ala, AL, USA

problem #40

Mar 012011


  • miles


S10 appropriate handling- letter to the secretary from requesting dot start an investigation similar to Toyota' S regarding the engine flooding of the 2004 Mazda RX8 the consumer state the dealer had his vehicle for 10 days. After 10 days of unsuccessfully trying to diagnose what the problem was, their final solution was to flush and clean the engine in hoping to cover-up the unresolved mechanical issue. In doing so, they only made the problem worse.

- Los Angeles, CA, USA

problem #39

Apr 012005


  • miles
The contact owns a 2004 Mazda Rx-8. while stopped with his foot on the brake pedal, the contact stated that the vehicle suddenly stalled. After several repeated attempts, he was able to restart the vehicle. The failure occurred intermittently and more frequently when the air conditioner was turned on. The contact also noticed that the engine lacked power. The vehicle was taken to an authorized dealer where it was repaired (repair details were not given). The failure continued and progressed. The failure mileage was unknown and the current mileage was approximately 42,000. Updated 01/13/11 updated 01/24/11

- Camanche, IA, USA

problem #38

Aug 182010


  • 74,800 miles
The contact owns a 2004 Mazda RX8. The contact was driving approximately 50 mph when the check engine warning light illuminated. The dealer advised that the shutter valve would need replacing. The vehicle was not repaired. The failure mileage was 74,800 and the current mileage was 74,820.

- Talbott, TN, USA

problem #37

Jun 252010


  • 43,358 miles
The contact owns a 2004 Mazda Rx-8. the contact stated that the ignition cylinder on the vehicle malfunctioned. The engine warning light illuminated while driving approximately 55 mph and the vehicle stalled. An excessive amount of smoke was also bellowing from underneath the vehicle. The dealer stated that raw gas was being dumped into the catalytic converter which caused a fire to occur in the wiring harness. The vehicle was towed to the dealer and who stated that the wiring harness and the ignition cylinder needed to be replaced at the owners expense. The dealer called the Mazda district representative to discuss the failure and they stated that there was nothing they could do. The vehicle was not repaired. Mazda filed case number 130341420 regarding the failure. The failure and current mileages were 43,358.

- Las Cruces , NM, USA

problem #36

Jul 122010


  • 30,000 miles


I own a Mazda RX8 and I have had so many problems with it, I would come to a stop and it will stall, can't start it back up and have to have it towed to the shop. I will drive it to the store and come back out to leave and it will not start, have to have it towed. Have had the engine replaced one time already and it still has all the same problems. I can not drive it now because it is completely dead and will not start it has been in this condition for almost a month. Mazda most of the time says they can not duplicate the problem and as soon as I leave my car would break down on the way home. If you go to the web site you will see that this car is just a death trap and so many people are having all the same problems with this car that I am. Please do something about this. I am not a wealthy person and can not afford to be taken advantage of like this. I paid $23,000 for this car and it is costing me an arm and a leg to keep it running. I do not own another car.

- Chicago, IL, USA

problem #35

Jun 012010


  • 95,000 miles
I slowed to let the car infront turn. When I pressed the accelerator again, a big cloud of white smoke came out the exhaust and the engine completely died. I was able to push in the clutch and coast into a fire department. I tried to restart the car once stopped but it wouldn't restart. I could smell oil coming from the car while trying to start it which leads me to believe that the oil seal is blown. Once towed to pearson Mazda, I was told that the car needed two coils and spark plugs. Once those where replaced, the car still didn't run correctly so a compression test was done in which it was found that there is no compression on the rear rotor and the motor would have to be replaced. On Friday the fourth, three days after the initial incident, I was told that Mazda wouldn't cover the motor under warranty because the catalytic converter was hollowed out. Now anyone that knows about cars knows that a hollowed cat won't cause an oil seal to go on a motor. It has been documented many places on the internet were these motors last as little as 20,000 miles and have to be replaced. Mazda doesn't want to take responsibility for a defective product. It has now been two weeks and Mazda still has not responded to my many calls to get this reversed.

- Chesterfield, VA, USA

problem #34

Apr 032010


  • 67,483 miles
The contact owns a 2004 Mazda Rx-8. the contact stated that while traveling at speeds of 50 mph, the vehicle began decreasing in speed without warning and stalled. The contact was able to restart the vehicle. On a separate occasion, while driving at speeds of 50 mph, the vehicle began to shake violently. The check engine and battery warning lights illuminated on the dashboard and the vehicle stalled. The vehicle was not taken to the dealer for diagnostic testing or repairs. The failure mileage was 67,483 and the current mileage was 67,000.

- Corpus Cristi, TX, USA

problem #33

Apr 112010


  • 70,000 miles
Im pretty bummed out, im an owner of an 04 Mazda RX8 and about a month or so the heart (engine) of the car suddenly gave out, I took it to the dealer to get it checked out and the news they gave me was that I needed a new engine, they asked me for maintenance records which I couldn't provide them with because I do the tune ups myself, they want receipts but lets be honest its hard to keep track of them, so they said no records no receipts it will cost you over 3K to get the job done. I see a lot of complaints and recalls online for this vehicle and know that mine falls in that category also. I have witnesses that see me do my oilchanges and store employees that know I buy tune up products from there store. What can I do to fight for my rights?

- Casa Grande, AZ, USA

problem #32

Apr 102010


  • 43,123 miles
2004 Mazda Rx-8, under 45K miles. Driven on a 78 degree day for 2 hour trip. Stopped to refuel and 30 min shopping. Get into car onto highway where I need my engine's speed to accelerate onto highway. I feels like half the power is gone. It reminds me of vapor lock, it's gasping for fuel or spark. This has been experienced many times before and nearly dangerous when in busy traffic, as had to pull over to birm. I know dealer replaced coil packs once or twice so far...along with plugs. This is the most dangerous car I ever owned. The most re-called car I've ever known of. Right now it's running fine, matter of fact has power to spare as compared to it's 'whimping out syndrome ". there must be a corporate solution from Mazda to me. I am ready for a lawyer.

- Portsmouth, OH, USA

problem #31

Mar 102010


  • miles
I don't even know where to begin with the problem I have had with my 2004 Mazda Rx-8. I have owned it since September 2003 and it has had countless issues, parts replaced and failures. The incident I experienced last night put me over the edge and almost cost me my life. My Rx-8, which was just at the dealer 2 weeks ago, had an engine malfunction while I was on a major highway in Massachusetts. The speed of the vehicle went from approx 50mph to 10mph in a matter of a few seconds. Luckily I was able to make my way to the breakdown lane without injuring myself or anyone else; however, this is unacceptable. Every single part in my Rx-8 has been replaced except for the engine mounts and engine. I have dished out thousands of dollars already and the vehicle only has 44,000 miles on it. Not only is this a safety hazard to those of us driving the vehicle, but it is also a safety hazard to those around us. Had the car behind me not been paying attention my vehicle could have caused a deadly car crash in the middle of rush hour on a major highway. I have contacted numerous dealerships, the BBB, and am now looking into a class action lawsuit. Mazda needs to be held accountable for their actions. Unfortunately because my car was purchased in 2003, BBB wouldn't have anything to do with the case, however I have 57 pages of detailed repairs that have been made to this vehicle since I owned it, which I am more than happy to send to you. Tons of people online have had similar issues; just from there are 30+ email addresses of individuals who have experienced problems similar to mine. Please help us get to the bottom of this faulty engine and make Mazda own up to their mistakes. People's lives are in danger and this is neither acceptable nor ethical. Ps- an employee of NHTSA has been contacted prior regarding this situation. Her name is cortney and her contact information is 1-888-327-4236 ext #: 1268. I received this from the forum.

- Andover, MA, USA

problem #30

Oct 312004


  • 5,647 miles
My Mazda RX8 has been burning oil since it was new. I don"T have it anymore. Do I have any recourse against Mazda corporation?

- Wenatchee, WA, USA

problem #29

Jan 082009


  • 59,000 miles
The contact owns a 2004 Mazda RX8. When attempting to turn the ignition the vehicle exhibited a no-start condition. The battery was replaced. The repair did not remedy the failure. The vehicle was towed to an independent mechanic for inspection. The technician was unable to identify the cause of the failure. The vehicle was taken to the independent mechanic on four separate occasions for identical failures, but the failure has not been remedied. The failure mileage as 59,000. The current mileage was 62,000.

- Massillon, OH, USA

problem #28

Aug 202009


  • 60,000 miles
I noticed massive amounts of oil leaking from under my 2004 Mazda RX8 onto the driveway of a friend's landlord's driveway. I drove it into the dealership and was told that the oil cooler lines had corroded and needed to be replaced for $1200. Mazda does not cover this under warranty but has issued a recall in Canada for this very issue but does not recognize it in the U.S.a. leaks can be fairly slow and unnoticeable for quite a while and coat the wheels and brakes with oil, causing loss of handling and trouble braking.

- Hope, RI, USA

problem #27

Sep 022009


  • 98,000 miles
The vehicle is a 2004 Mazda Rx-8. the oil lines connecting the engine to the oil cooler ruptured sending oil spewing all over the tires and brakes. The engine lost 100% of it's oil and controlling the car was difficult. This problem is reportedly due to excessive corrosion of the oil lines in cold climates where salt is often on the road. In Canada, there is a recall for this issue. There should be one in the us as well.

- Andover, MA, USA

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