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really awful
Crashes / Fires:
0 / 3
Injuries / Deaths:
1 / 0
Average Mileage:
73,794 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 exhaust system problems

exhaust system problem

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2004 Mazda RX-8 Owner Comments

problem #9

Nov 152010


  • 97,000 miles


The faulty oil injector releases excess oil and as a result drowns the catalytic converter and spark plugs. Because of this the car eats through spark plugs and when running at a low RPM the car will shut down which has happened on numerous occasions and in the middle of traffic. With this knowledge Mazda put out a recall (4206F) to replace the spark plugs, catalytic converter, and perhaps even the engine. My car was tested and the local dealership found that it falls within the recall. Mazda headquarters isn't honoring the recall or the dealer's findings and is saying that it is a maintenance issue and will therefore not replace or repair anything.

- Santa Rita, GU, USA

problem #8

Aug 252010


  • 119,000 miles
Driving down the highway and vehicle lost engine compression in traffic. Almost was rearended.

- Monroe, NC, USA

problem #7

May 212010


  • 72,000 miles
The contact owns a 2004 Mazda Rx-8. while driving at 45 mph the exhaust system overheated and caused unknown wires to overheat and smoke. The dealer advised there were no recalls on the vehicle. The vehicle was not diagnosed or repaired. The current mileage was 80,000 and the failure mileage was 72,000.

- Boone, NC, USA

problem #6

Sep 202009


  • 45,000 miles


I own a 2004 Mazda RX8 and have never had more problems with a car in my life. Shortly after buying it, it would not start, had it towed to dealer, they could not find a problem. Have had to have it towed 8 times now because it stalls when coming to a stop or when taking off. It has sat all winter due to not starting. My had sweat just thinking about driving this car and I will only take back roads, one near miss on the highway was enough for me to stay off and stay on back roads, at least then I have some chance of getting it to the side of the road. My car has been in the shop so many times I have lost count although I have all of the repair orders. They did replace the engine, but it still runs rough, now the engine lite is on again!!!! this is the only car I have to drive and I can not trade it in because all the dealers know about the car and will not give me even one half of what I paid for it. I have seen so many complaints on this car for so many reasons and can not believe the car itself has not been recalled. They should buy them all back for what we paid for them mine was $23,000. Why aren't you doing what you have done to Toyota"?????" I am going to die in this car!!!!!!!!!!!!!! you ask for approximate incident date, well I have about 20 of them and you only allow one.

- Chicago, IL, USA

problem #5

Jan 122009


  • 55,000 miles
I'm very upset, I bough my car RX8 2004 on January 2009 from a Mazda dealer and my car just died 3 month after buying the car, they won't replace my engine because of and aftermarket headers. Now I understand that aftermarket parts will void the warranty of the car but the first month I bought the car went to the dealer 5 times and I have the record of that, the knew the car was damage and they never replace my engine now that I put my headers and they saw them they don't want to replace it and pretty much I lost 13K on a car that last me only 3 month and I'm still paying the car a month I don't have money to repair the car just because they knowing that this cars have problems and still don't want to help if I don't have car I probably can lose my job and trust me I don't want that but I can even buy a nother car because I'm still paying this car I need my car fix and I want someone to take action on this, I will really want to reports this issue to the local news papers and let everyone knows about this please help me here I can afford to lose my job my wife doesn't work and my son is only 2Y and 5 month please someone help me...!!!!

- Miami, FL, USA

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problem #4

Dec 082008


  • 37,250 miles
Engine light came on with no noticeable problems. Called dealer who advised bringing it in. On way to dealership, approx. 4 miles, car began to misfire, producing smoke from exhaust pipes. By the time I pulled into the dealership, smoke was coming from every area of underside of car, as well as interior. Wife following said flames were coming from both exhaust pipes. Car only has 37,000 miles, and all dealer servicing were done since purchase of vehicle. After 2 weeks of contact with home office, Mazda has agreed to pay for repairs of exhaust system, but I am liable for physical damage to car which includes melted carpeting, spark plugs, etc. Was told both coils were the cause of problem.

- Santa Maria, CA, USA

problem #3

Nov 282008


  • 55,000 miles


My 2004 Mazda Rx-8 catalytic converter went out twice in less than 1 year. My personal mechanics said to take it back to the dealer and that blogs on line said the engine would loose compression and the engine would go out completely. I read several complaints online about that very same thing. The dealer said they would replace the catalytic converter again. I said what about the low compression and engine failure down the road. And the service manager said that what the 100K warranty is for. I don't think that's right they should buy the car back from me. It is not dependable. It is at Mazda city of orange park, fl. Phone # 904-7790600.

- Orange Park, FL, USA

problem #2

Jul 022008


  • 78,900 miles
I bought a 2004 Mazda RX8 brand new in early 2005 from the dealer. I have had to have it towed in for repair over 10 times. They have tried to fix it each time. They even had to replace the engine after only 23,000 miles. Now looks like I will need another engine. They have had numerous recalls on it. It has stalled on me before but the other day it almost cost me my life. It stalled due to hot weather with on coming traffic. I nearly had a head on collision. After doing some research I find that it has yet more recalls on it for same problem of stalling. This is a very unsafe car. I read on different forums of all the horror stories others are having with same problems. The dealerships are trying to say there is no problem or that its something we did and try to charge us to repair their defects. Something has got to be done before people are killed. I now find out that no one wants to take it in on trade for fair value. Mazda sold this car before it was ready for production and they should buy it back at fair value. They need to get them off the road before its to late. Please help put pressure on them to do what's right.

- Decatur, AL, USA

problem #1

May 302008


  • 105,000 miles
The 2004 RX8 has internal seals fail prematurely. This causes the engine to "blow" by a loss of compression in one of the two rotor chambers. The problem being the car with still run with half power. I continued to drive to find help off the highway. The rotor that is not working is dumping gas into the catalytic converter. By the time I parked, I could smell burning fiber and plastic and the exhaust shot out several large chunks of red hot ceramic material. The catalytic converter was bright orange and the entire underside of my car is melted. Looking on internet under "2004 rx 8 engine failure" I have seen several other stories with similar results but worse. Is it possible that the fuel tank could explode with such heat so near if you continued to drive. This happens anywhere from 12,000 miles to 100,000 miles and beyond. Mazda knows of the engine defect and has extended the warranty on the motor as of May 2008. My car is at hancock Mazda in dallas. They said damage amounted to $9,500 from heat.

- Mabank, TX, USA

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