If you are considering buying a used Mazda RX-8, these are the common problems worth knowing about first. Our garage database tracks 2 known faults for this model, 1 of them rated high severity. Every one below is a repair bill a seller has good reason not to mention.
Found a Mazda RX-8 for sale?
Paste the advert and we read it against its known faults, its MOT history and the DVLA record, and tell you what the seller has not. Free, about a minute, no card.
Check a Mazda RX-8 advert (free) →The Mazda RX-8 has 2 known faults in our database, 1 of them rated high severity. The most serious are engine (rotary engine apex seal wear causing total loss of compression) and engine (the Renesis rotary runs very rich while it warms up, so a car that is started). None of them makes the car a bad buy on its own; the risk is a seller who knows and says nothing.
That is a count of the faults we hold, not a reliability score. Popular cars get written about more, and a newer generation has had less time to show its faults.
No year is a write-off on its own. What matters is which serious faults a given year and engine can have, and whether the car in front of you has had them fixed.
Each one is set out in full below, with the symptoms, the typical mileage and a rough repair cost.
Sellers rarely admit these faults outright
We track 7 specific phrases sellers use in adverts to soft-pedal these exact issues. Paste any Mazda RX-8 advert and we check it in seconds.
Check an advert now (free) →Recall work is done by the manufacturer, and GOV.UK says you will not usually have to pay for it. These are the 4 DVSA recalls for the RX-8, newest first. They do not tell you whether this particular car has had the work: for that, put the registration into the free GOV.UK MOT history check, which shows a recall status where the manufacturer shares it, or ask a franchised dealer to check the VIN.
Fuel may leak from fuel pump rings.
Put right by: Replace the fuel pump rings with new ones.
Passenger airbag inflators may not operate as intended.
Put right by: Replacement of Airbag Assembly on affected vehicles.
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. The resin fuel pump discharge pipe mounted to the upper part of the fuel pump body (within the fuel tank) may also deteriorate following exposure to heat from the engine and exhaust systems. This deterioration may cause the pipe to crack creating a fuel leak which could increase the risk of a vehicle fire. Fuel may leak from either the upper surface of the fuel tank and /or the fuel pump discharge pipe. In the worst case this may result in a fuel leak. This in turn could increase the risk of a vehicle fire.
Put right by: Replacement of the resin fuel pump rings and the fitment of heat insulating pads on the upper surface of the fuel tank to prevent future deterioration by heat of the engine and exhaust systems. The fuel pump filter body will also be replaced with a modified version in order to address the concern of the deterioration of the fuel discharge pipe.
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.
Put right by: Replace both left side and right side lower arms with modified units.
Recall data published by the Driver and Vehicle Standards Agency under the Open Government Licence v3.0. A recall listed here may not apply to every car of this model: the build dates and the registration check are what decide it.
Skipped servicing is the cheapest thing for a seller to hide on a used RX-8. These are the figures UK specialists work to.
Rotary engines do not have timing belts or chains. However, the apex seals are a critical wear item that typically require a full engine rebuild every 60k-80k miles.
Always confirm against the vehicle handbook. Intervals vary by engine, and several manufacturers revised theirs after failures in service.
No Mazda RX-8 year is a write-off, but the FE (2003 to 2012) carries the most serious faults: engine. Year matters less than whether the specific car has had the known fixes, so check the history for them.
Ask the seller about the engine faults on this page and whether they have been fixed, with invoices. On the test drive watch for extremely difficult to start when the engine is hot and hard starting or refusing to start after a short run (flooded). Read the MOT history for repeat advisories, then paste the advert into the free check, which reads it against its known faults before you travel. Check a Mazda RX-8 advert →
The DVSA lists 4 safety recalls for the Mazda RX-8 issued between 2018 and 2021. The most recent, from December 2021, is "Fuel may leak from fuel pump rings". Recall work is done by the manufacturer, and GOV.UK says you will not usually have to pay for it. This list is by model, so it cannot tell you whether one particular car has had the work: the free GOV.UK MOT history check shows a recall status from the registration where the manufacturer shares it, and a franchised dealer can check the VIN.
Owners report 20.1 mpg on average across the Mazda RX-8 engines with data, about 77% of the official combined figure. The gap between official and real-world economy varies a lot by engine, so the Real MPG page lists every engine and generation separately, from 118 owner submissions. Mazda RX-8 Real MPG by engine →
Looking at a Mazda RX-8 right now? Check the advert before you go and see it.
If you used to check the Honest John “Good & Bad” section before the site closed in 2026, this page is where that information now lives. We rebuilt the Mazda RX-8 owner-report history from the archived Honest John dataset, added our own research, specialist and owner-club sources and DVSA recall data, and we keep it free. Each fault above is badged with its source. The same data feeds our free advert check, which reads a listing against every known fault for the exact engine and year.
CarAdCheck is not affiliated with Honest John or Volkswagen Financial Services. What happened to Honest John, and where each feature lives now.
Knowing what a Mazda RX-8 goes wrong with is half of it. The rest is reading the advert and checking the car's history before you hand any money over.