Common Problems with the Mazda RX-8
FixMyCar discusses common problems with the Mazda RX-8 and average repair costs.
Compare Mazda repair quotesEllie Dyer-Brown
Friday April 10 2026
6 min read
The RX-8 is an affordable and stylish sports car produced by Mazda between 2003 and 2012.
This guide examines known issues with the Mazda RX-8, providing owners and potential buyers with insights into specific faults and their average repair costs.
In a nutshell: The Mazda RX-8 is exciting to drive, but it isn’t a particularly reliable used car. Common problems include rotary engine wear, hard hot and cold starting, ignition faults, suspension knocks and rust, so buying a well-maintained car with a strong service history is essential.
What's wrong with the Mazda RX-8?
Drivers are searching online for information about the following topics.
Mazda RX-8 cold start problem
Some RX-8s can be difficult to start when the engine is cold, especially if the car has only been moved a short distance and then switched off again. This can leave too much fuel in the engine, so when you try to start it later, it turns over but won’t fire up properly. If an RX-8 is used mainly for very short trips, this problem is more likely to occur.
Here’s how to start a car with a flooded engine.
Mazda RX-8 engine problems
The RX-8 uses a rotary engine, which generates power by spinning a rotor rather than pistons found in most petrol engines. It helps make the car light and sporty, but it’s also more vulnerable to poor maintenance and can wear out early if it hasn’t been properly cared for.
A good service record and regular oil checks matter more here than they would on most conventional petrol cars.
Find out what to check when buying a used car.
Mazda RX-8 hot start problem
Some RX-8s are hard to restart when the engine is warm. A common reason is low compression, which means the engine isn’t building up enough pressure inside to start properly once it’s hot. A weak starter motor can also make the problem worse by not spinning the engine fast enough.
Recalls
| Recall number | Date | Reason |
|---|---|---|
| R/2021/411 | 13.12.21 | Fuel may leak from fuel pump rings. |
| R/2018/317 | 19.11.18 | Passenger airbag inflators may not operate as intended. |
| R/2018/014 | 31.01.18 | On the subject vehicles the resin fuel pump rings located on the top surface of the fuel tank may deteriorate by heat from the engine and exhaust pipes. Over time this deterioration could cause the fuel tank to leak which may increase the risk a vehicle fire. |
| R/2018/015 | 31.01.18 | The front lower arm ball joint casting may have a crack due to inappropriate manufacturing process being used. In extreme driving conditions this could cause the casting to break and the ball joint to become detached. If this happens it could result in the driver losing control of the vehicle. |
Mazda RX-8 2003-2011 problems
1. Premature engine failure
Mazda RX-8 13B-MSP Renesis rotary engines often fail early due to low compression, carbon buildup, and worn apex seals. Signs include hard hot starts, high oil use, overheating, and coil failures.
What repair is needed for premature engine failure, and how much does it cost?
A full engine rebuild is often required, which can cost thousands. The average cost of an engine replacement on FixMyCar is £1,997.14. Ideally, you should take preventative steps, such as regular oil changes, and, if you’re looking to buy a used model, make sure it comes with a full service history and evidence that it has been well looked after.
2. Ignition problems
Some RX-8s are also difficult to start from cold, especially if they’ve only been moved a short distance and switched off before warming up properly. This can leave too much fuel in the engine, making it reluctant to fire up next time (known as a ‘flooded engine’).
Worn ignition coil packs can make matters worse, and they’re a known service item on these cars. If an RX-8 is slow to start, misfires or feels down on power, the ignition system is worth checking.
What repair is needed for ignition problems, and how much does it cost?
The car may need its ignition coils and spark plugs replaced, and the battery and starter should also be checked. If the catalytic converter has been damaged by repeated flooding, that can add a lot to the bill. Average repair prices are listed below.
Ignition coil replacement: £184.12
Spark plug replacement: £165.74
Battery replacement: £261.51
Starter motor replacement: £385.84
3. Worn front suspension
The RX-8’s chassis is generally tough, but front anti-roll bar drop links are one of the few suspension parts that commonly wear out. If you hear a clunk over bumps or rough roads, that’s one of the first things to suspect. It’s not as serious as the engine issues, but it’s still worth fixing because it can spoil the way the car drives.
What repair is needed for worn front suspension, and how much does it cost?
The usual fix is to replace the worn drop links or bushes. Replacing front suspension bushes costs an average of £247.19.
4. Rust
Rust is another area to watch carefully on an RX-8, especially underneath the car. UK used car advice highlights corrosion on the oil cooler and front air-conditioning radiators, and some cars have also needed front oil pipes due to rust caused by water getting in through the wheel arch liners. If you’re viewing one, it’s worth getting underneath the car and checking for corrosion.
What repair is needed for rust, and how much does it cost?
The cost depends on where the corrosion is and how bad it is. The fix could be anything from replacing rusty oil pipes to more significant underbody rust repairs. The average rust repair price on FixMyCar is £361.73.
Years to avoid
There isn’t one single RX-8 model year that’s always bad, because condition and engine health matter more than the registration plate. That said, if you want to play it safe, it’s worth being more cautious with earlier 2003-2008 cars, because later face-lifted models benefited from updates and improvements.
Is the Mazda RX-8 reliable?
The Mazda RX-8 is not especially reliable, and it’s best bought as an enthusiast car rather than everyday hassle-free transport. A well-maintained example can be good, but the rotary engine is a known weak spot, so service history, oil checks and a proper compression test are essential.
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Ellie is FixMyCar's Content Manager. She has over three years of experience writing about cars and regularly collaborates with automotive experts to provide trustworthy advice for drivers that is easy understand. Her work has been featured in Yahoo! Finance, iNews, The Daily Express and The Sun. She has a BA in English literature and an MA in creative writing from Durham University. Outside of work, Ellie follows F1 and eagerly awaits Ferrari's next era of dominance in the sport. She drives a Suzuki Swift.