Mazda RX-8 Mazda RX-8

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Mazda RX-8 repairs by problem area

Engine (52%)

Transmission and Drivetrain (12%)

Brakes and Traction Control (0%)

Suspension and Steering (4%)

Electrical and Air Conditioning (17%)

Paint, Rust, Leaks, Rattles, and Trim (11%)

Other (3%)

Chart based on 391 repairs.
See TSBs and recalls for the Mazda RX-8.

Mazda RX-8 engine repair cost distribution

$2500+ (5%)

$1000 - $2499 (10%)

$500 - $999 (12%)

$100 - $499 (33%)

< $100 (40%)

Chart based on 173 repair trips. The repair cost chart excludes repairs made under warranty, do-it-yourself repairs, and repair trips that include maintenance.

2006 Mazda RX-8

Engine not specified

17000 mi Engine replaced due to low compression. 
82000 mi Engine light notifying of cat failure, loss of power. Catalytic converter replaced under warranty. A year earlier (4/10) the engine an intake manifold were replaced. 
98000 mi Motor Mounts went bad - severe vibration and idle roughness 

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2006 Mazda RX-8 4dr Coupe

238-horsepower 1.3L R2 6-speed manual RWD

39000 mi

US $100
Coolant overflow bottle replaced to fix defective coolant level sensor. 
42000 mi Catalytic converter replaced 
49000 mi Sticking secondary shutter valve in intake system at low ambient temperatures. Problem went away when weather got warmer. 
67000 mi

US $80
Engine flooded. 
45880 mi

C $191
low coolant level warning light came on when the coolant level was fine; known problem with RX-8s (Bulletin No: 01-040/10 
58280 mi

C $370
Replaced the Secondary Shutter Valve as per service bulletin 01-019/08 (MIL ON - P2070 SET). Original SSV is prone to sticking due to carbon deposits; part replaced with new design from Mazda. Replaced ignition coils, spark plugs, and wires with aftermarket units from BHR. Car was hesitating around 5-7000 RPM ~$700 CAD for all parts 
66340 mi Flooded engine 
44000.0 mi radiator reservoir. valve getting stuck closed replaced under warranty. 
43000 mi Radiator reservoir not cycling fluid. Not opening under acceleration. Needs to idle for fluid to cycle. 
36000 mi total engine failure Total engine replacement. After first engine replacement failed it took 8 more work days to install a 3rd engine. After engine was replaced..... I needed a new catalytic converter. Catalytic converter failed. 
27900 mi The infamous RX8 flooding problem, which required a tow, priming, and plugs replacement to restart. 
20000 mi

US $400
excessive fuel consumption 
21000 mi

US $375
excessive fuel consumption--8 with regular driving 
41000 mi Engine warning light. Dealer replaced ignition coils under warranty. Next day, engine broke a seal (catastrophic event) and engine needed to be replaced. Took 2 wks to get engine and another wk to install. 
6000.0 mi Cat rattling/fell apart/replaced under warranty. Took the dealer 4 attempts after 4 breakdowns to find the cause. Not impressed 
29000.0 mi

£2000
Another catalyst has fallen apart. Out of warranty so huge bill. $2000. Not impressed 
30000.0 mi

£7500
Engine running on one rotor, failed compression test. Needs a new engine, in the Uk so only 3yr warranty. $7500 to repair. Not impressed Engine running on one rotor, failed compression test. Needs a new engine, in the Uk so only 3yr warranty. $7500 to repair. Not impressed 
33000 mi

£2780
Rear rotor - rotor tip seal failed with a tiny piece breaking away - about a 1mm deep. After much arguing with mazda UK they providea new engine but i had to pay an excessive amount to the stealers to put the engine in. 
54000 mi

US $1200
Needed new Ignition Coils / Plugs and Wires Catalytic Converted failed and needed replaced 

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2006 Mazda RX-8 4dr Coupe

212-horsepower 1.3L R2 6-speed shiftable automatic RWD

41788 mi

C $280
Check engine light diagnostic - clear cam sensor error. Install winter tires, detailing. Check engine light diagnostic - clear cam sensor error. Install winter tires, detailing. 
200.0 mi Purchased car, CEL at 200 miles - faulty gas cap gasket 
14000 mi Both engine mounts were cracked. Dealer said this is common, and they put better, upgraded mounts in. I noticed the problem because the idle was extra loud, and you could even feel in in the pedals. 
27700 mi

US $1100
First time ever, the engine flooded and car would not start. Now, I rev the engine before shutting off, but sometimes it still is hard to start. It is possible to due to car's age. 
23200 mi Flooded and wouldn't start. Flooding procedure did not work for owner 
24000 mi idling rough when outside temp below 40F. Emissions pump had stuck sensor 
45500 mi Rotary motor carbon build up. Motor replaced under warranty paid by manufacturer 
68000 mi Catalytic converter replaced under warranty 

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2005 Mazda RX-8 4dr Coupe

238-horsepower 1.3L R2 6-speed manual RWD

40000 mi

US $500
Needed to clean throttle body and other intake parts Bad coil packs and spark plugs 
58000 mi Thermostat failed. Engine overheated and radiator basically blew up. 
58000 mi

US $7000
Low compression. Had to have a rebuilt engine installed. 
80000 mi repair and replace wiring harness to fuel pump, replace fuel pump due to hole burned into pump by faulty wiring harness 
80000 mi

US $210
engine would not start, ran rough. Installed second set of plugs and wires since new. Issue was resolved 
72540 mi

C $1200
Engine compression low, couldnt start car when warm, car stalled at idle. Engine had to be replaced. 
106020 mi

C $1300
Coils, spark plugs, and wires. 
106020 mi

C $400
Rotary seal was gone. Engine required a rebuild. 
83000 mi Replaced the cat, non-OEM with melted internals, with a catless mid pipe. 
59520 mi

C $900
Some emissions coil 
62300 mi

C $1100
Flooded car, towed to shop. While deflooding car preventively replaced plugs and wiring, water pump, thermosat, air filter, upper and lower radiator hoses. 
64480 mi

C $1072
Coils all replaced and battery replaced ... and maintenanace done also 
68200 mi

C $212
Engine - compression off and was told needed new engine ... Have been complaining to dealer for over a year about light coming on... now the engine is toast. THEN I find out Engine warranty WAS in effect until Sept 2013.Did not honor 
66000 mi

US $150
Rear O2 sensor failed 
133200 mi

US $157
I noticed a drastic decrease in fuel economy, so I decided to change the ignition system with OEM parts. Fuel economy has increased by 7 MPG. 
22000 mi

US $400
Engine flooded rotary engine, weak battery, new battery replaced twice. 
23000 mi would not start. engine flooded. Also weak battery which was replaced with new upgraded one. 
60000 mi

US $2500
Broken mount 
69000 mi

US $1700
Replace radiator, water level sensor 
72000 mi

US $1500
Emissions sensor 
87900 mi

US $300
Gas tank fuel ring broken. 
90000.0 mi

US $70
Engine not starting when hot. Loss of compression on front rotor and rear rotor is marginal. Fix is replacement engine at cost $5,000. No repair. We plan to trade off car. 
34200 mi At 34K, car's original coils were replaced as a precaution. Replaced plugs and wires, too. On way home, engine stalled while idling in traffic. Happened repeatedly. Problem turned out to be computer glitch due to coil replacement. 
37300 mi

US $264
CHECK ENGINE LIGHT (non-flashing): • P0442: Small EVAP leak • P0456: Very small EVAP leak PARTS ORDERED: • Purge Valve • Gas Cap PARTS: $140 LABOR: $124 New purge valve and gas cap installed. 
47000 mi

US $900
Loss of power at low RPM. Solved by new plugs, coils, wires, and throttle body cleaning. 
57000 mi loss of torque, failed compression test, dealer replacing engine under warranty 
57000 mi

US $110
Engine was failing vacuum test. Dealer replaced engine. 
55800 mi Engine died, lost compression. Mazda warrenty replaced the engine for free with a new one. 
20000 mi Engine making a rattling sound when accelerating. Commonly known on the RX8 forums as "marbles in a can". Not diagnosed by dealership (unable to reproduce), however I've read this is detonation or knock. Noise is obvious, but dealer couldn't hear. 
43000 mi Water pump leak...replaced under warranty. 
58000 mi

US $120
Sputtering at low RPM & rough idle. Ignition coils required replacement (coils are "weak" in this vehicle and fail prematurely). Coils purchased and replaced. Also replaced plugs & wires. Total cost for all parts roughly $350. 
69100 mi

US $400
Corroded oil cooler line cracked and developed massive oil leak. 
44000.0 mi

US $50
Saw smoke coming out of tailpipe when floored. Oil got into intake somehow, even though oil wasn't overfilled. Cleaned out oil, changed airfilter. Installed oil catch can to prevent reoccurrance. Believe oil recovery process was changed on later RX8s. Oil got into the intake somehow, even though my oil wasn't overfilled. Cleaned out oil and changed airfilter. Installed oil catch can to prevent future occurrance. 
88200 mi

US $500
Hot start problem. Replaced coils and plugs. Did not solve. Later checked compression - 90psi. Battery is only 2.5 years old and this car got the faster starter in 2006 so the problem is prob not electrical. 
89000 mi Hard start not fixed. New owner aware of low compression, will try to drive it this way. 
54000 mi Clogged Catalytic Converter. Replaced under warranty. 
75000 mi

US $240
Front O2 Sensor failed 
96000 mi

US $54
Low compression, engine replaced under warranty 
109000 mi

US $700
General cooling system failure. Slowly pushing coolant out of overflow, even at idle before thermostat opening. Not sure of specific cause. Everything replaced (rad, thermostat, coolant hoses, coolant bottle). 
87000 mi

US $130
rear O2 sensor replaced 
70000 mi The car flooded causing the engine to to start. Dealership did a de-flood and de-carbon on the engine under warranty  

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2005 Mazda RX-8 4dr Coupe

197-horsepower 1.3L R2 4-speed shiftable automatic RWD

13259.0 mi Replaced both engine mounts and engine mount bracket. Adjust headlight beam height. Replace lower right and left side rocker panel moldings/deformed,again 
34600 mi Coolant level sensor went bad, causing the light to come on when the coolant was not low. They replaced the reservoir to fix the problem. 
82000 mi

US $900
Compression failure. Engine to be replaced. 
68200 mi Engine Failure/low compression/engine replaced with reman. engine 

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2005 Mazda RX-8 4-door

2-cylinder manual 2WD

66000 mi

US $100
Check engine light came on. Mechanic said it was a spark misfire, but need to bring the car back for "computer diagnostic." Might need a whole new engine. failed the vaccuum test. Replaced the whole engine with new one. 
67000 mi After getting a new engine, came back because the check engine light came back on. Said it was a cracked valved part. Now the steering light came on. Really hard to turn the steering wheel. Don't ever get this car. Been at the shop for soo many reasons. 
26660 mi Replaced coils. 

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2004 Mazda RX-8 4dr Coupe

238-horsepower 1.3L R2 6-speed manual RWD

64000 mi

US $220
I was receiving CEL for a misfire in Cyl 1. Kept resetting, then finally died at high RPM randomly and finally limped home. Replaced coils, wires, plugs. The plugs looked like they were original. 
56420 mi

C $300
Fuel pump failure 
59000 mi

US $545
Replaced ignition coils along with maintanence replacement of plugs and wires 
76000 mi

US $300
Light on for coolant level, replace coolant tank and sensor, when replacing tank a tube broke off radiator, install new radiator 
62000 mi

US $7800
blown gaskets 
63000 mi

US $175
Replaced rear o2 sensor. 
49000 mi

US $200
O2 sensor replaced. wasn't damaged before going in. 
105300 mi

US $200
SSV stuck / failure 
106000 mi

US $200
SSV circuit low p0661 
107000 mi

US $850
Multiple electrical issues resolved 
107000 mi

US $500
pissing oil everywhere 
26040 mi

$600
Stuck secondary shutter valve. Cel: P2070 
32240 mi

$300
Replaced PCM / Main control module 
114000 mi

US $6700
I got a engine replacement for this car in december of 2011 and just recently, the engine blew again. I took it to mazda and they would not cover it by warranty and i was stuck paying well over $6,700 for repairs on it 
73275.0 mi

US $2050
Replace motor, spark plugs, coils, spark plug wires. 
77500 mi

C $500
OEM catalytic converter replaced at 95000 miles Emission air pump was replaced due to dry bearing in the electric motor 
82460 mi

C $4000
Engine replaced at 95000 miles due to blown seal in the rear rotor. Lost compression. OEM catalytic converter replaced at 95000 miles 
95000 mi

US $1000
Complete clutch replacement. Friction plate worn out, throw-out bearing hanging on by a thread. Very impressed that after countless track days and runs through the twisties the clutch finally gave out. Took 95,000 miles to do which isn't bad. 
137200 mi

US $1000
Water pump and coolant hose leaking. Water pump and cooling hose replaced Oxygen sensor failed 
72400 mi Car overheated. Thermostat and waterpump replaced. Fan relay replaced. The work was performed under extended warranty.  Catalytic converter was found to have failed. Owner paid for catalytic converter Engine seals were found to leak. 
76000 mi Coolant hose was slowly leaking coolant on electric steering. Electric steering stopped functioning. Upon inspection, Mazda tech discovered that the coolant was shorting out the steering. Hose was replaced. 
70700 mi

US $650
Loss of power, smell of burning plastic, smoke from hood and in trunk compartment. Ignition of non-combusted fuel by catalytic converter in exhaust system melted oxygen sensor, trunk carpet & jack holder. Catalytic converter may be damaged. 
65000 mi

US $560
Car was running very rough with difficulty starting. Had 3 ignition coils replaced. 
22000 mi Engine running rough, harder to start than normal. Diagnosed as faulty coil pack, parts ordered waiting for repair. 
23000 mi One of two coil packs replaced, engine running normally. 
30000 mi Vehicle w/ a subsequent no start condition after being moved on home driveway. Towed to Dealer, half day in shop. Per dealer, carbon buildup, need to drive car at high speed or revs occasionally. I suspect flooding as this is a known RX8 problem. 
32000 mi

US $50
All four coil packs needed to be replaced, vehicle was drivable but advised to not drive too much while waiting for parts. Per tech could result in damage to catalytic converter. Overheat light intermittently illuminating. Per dealer coolant reservoir and sensor defective. Parts replaced on same visit as repair for coil packs. 
33000 mi

US $50
Noticed intermittent vibration at idle when A/C cycling on and off. Dx by dealer as two broken motor mounts, ordered under extended warranty. Deductible of fifty dollars. Motor mounts replaced, problem resolved. 
38000 mi

US $523
No start condition, dealer recommended decarbonization per TSB 01-015/08. Plugs changed and Zoom engine cleaner used. Car now starts but engine compression not in spec. Tech line notified per dealer. Waiting on results. 
39800 mi Previous engine showing low compression after no-start problem, engine replaced with factory rebuilt one. 
31000 mi

A $380
Sensor in the bottom of the Coolant Reservoir was required to be replaced. Check Engine Light would appear at nearly all times while driving. 
55000 mi

US $500
No start, replaced coils, plugs, re-flashed computer. Reflashed computer to reset after problem #1 to insure no additional, unknown problems. 
76000 mi

US $2000
Lost compression on the front engine rotor, the car could not be driven. The engine had to be replaced. I sourced an engine, purchased it, and installed it myself. 
65000 mi

US $360
Engine failure, replaced catalytic converter, ignition coils, and sparkplugs. 
108600 mi

US $700
Radiator replacement 
110000 mi

US $1500
New Clutch Heater Core Died Blown water seals 
107300 mi

US $40
Fuel pump replaced. 
125200 mi

US $4500
Replaced Engine. 
134000 mi

US $180
Coil failed. Replaced all with new. 
98000 mi

US $200
A new fuel pump was installed to replace the gradually failing original. The symptoms were hard starts, lack of acceleration when less than 1/2 a tank, and increasing long term fuel trims (trying to compensate for reduced fuel pressure). 
102500 mi Catalytic Converter Failure 
105000 mi

US $300
Installed an OEM quality MagnaFlow catalytic converter and silencer mid-pipe to replace the previously failed unit (failed one was aftermarket not OEM). 
177100 mi Replace radiator 
33000 mi

US $125
Malfunctioning ignition coils. dealer said 'it wasn't a problem'. Malfunctioning ignition coils. dealer said 'it wasn't a problem'. replaced coils myself, issues went away. 
110000 mi

US $1500
Spark plugs replaced 
112000 mi

US $300
Antifreeze reservoir and hose leaking. 
114000 mi Apex seals failed. 
38150.0 mi CELs - Replaced intake manifold that was cracked; replaced fuel tank cap; All under warranty 
69000 mi

US $45
PCM Computer reflash/update. 
81000 mi

US $210
Heat shield fell out of exhaust system. It took out an Oxygen sensor when it did that. Needed a new 02 sensor. 
97300 mi

US $300
Replaced broken motor mount 
2013.0 mi Dealer reflashed PCM to version "M". Oil/Filter change and tire rotation. 
30097.0 mi Dealer 4206F recall, replaced plugs and reflashed. Replaced trans and diff fluid. 
21800 mi Replaced ignition coils. Motor mount has been replaced with Mazsport (now defunct) solid engine mounts. Bounce totally gone. It did however break the stud securing the mount on the subframe but that was a result of a clutch kick around a round about. Fixed it with grade 10 bolt. 
51000 mi Bad PCM - Replaced under emmisions warranty 
38000 mi clogged catalytic converter 
66000 mi

US $170
igniton coils and spark plugs needed to be replaced 
70000 mi rear heated O2 sensor wiring harness melted so getting bad readings 
54000 mi

US $103
Engine compression tested below minimum levels. 
56000 mi Engine tested for low compression. 
68000 mi Hard starting when warm. Low power. Dealer ran decarb procedure but problem still exists. Dealer now claims they cannot replicate problem and it remains. 
68300 mi Car still hard starting when warm. Dealer stated. "We cannot do any more under warranty." The engine is considered normal by Mazda even though we understand this is not typical behavior. 
118000 mi Original thermostat stuck closed thus causing overheating. Replaced with new OEM part. Working waterpump replaced as a preventative step. 
123000 mi

US $120
Fuel pump started leaking at outlet after removal for cleaning. The plastic outlet is a known weakness on RX-8, which tends to develop hairline crack. Replaced 120k-mile Mazda OEM unit with Delphi FG1250, which was an OEM supplier. 
67200 mi

US $150
Replaced all 4 coil packs and wires. Appeared to be original. Just starting to fail. 
68000 mi

US $500
Gas Tank overflow badly leaking upon every fill up. Had to replace seals and two parts. Dealer only items. Fire hazard if left unrepaired. 
73500 mi

US $1300
Fuel pump failing replaced, solenoid for throttle positioner failed replaced, fuel vacuum sensor failed replaced. 
74000 mi

US $125
Recurring idiot light code for "Lean on Rotor 2". Dealer had replaced several items previously with this code. Replaced Mass Air Sensor in intake. Permanently corrected idiot light for lean condition. 
76000 mi

US $400
Motor mount was leaking. Had them install new set while there for normal maintenance items. 
85000.0 mi

US $200
Replaced SSV Solenoid due to CEL P0661 and mechanic physical tests of 3 solenoids controlling AIR, SSV and VDI behind intake manifold. I purchased the part thru Mazdaspeed at discount and Mechanic installed it. Cost $200 total. 
45000.0 mi Flash update to ECU 
76000 mi

US $120
Flooded after moving car when it was cold, improper warm up procedure. 
35000 mi Both O2 sensors failed within 1 week of each other. Replaced under warranty 
90000 mi

US $100
Service engine light and misfire- Failed leading, rear rotor ignition coil 
51800 mi Engine mounts needed to be replaced - were replaced under my extended factory powertrain warranty 
58600 mi Ignition coils failed, spark plugs fouled, very low on power and poor fuel economy 
80600 mi

C $50
Replace SSV vacuum actuator  
116300 mi

US $100
MIL P2096, Cleaned MAF, Replaced the downstream o2 sensor, Added Fuel injector cleaner to the gas tank. Replaced gasket between the Cat & exhaust manifold 
192000 mi

US $2100
Apex seal failure. Engine replaced. 
222000 mi

US $75
SSV solenoid replaced after failure. 
235000 mi

US $15
evaporator solenoid failed 
65000.0 mi Evaluation of Check Engine light led to an engine replacement. After the Check Engine Light came on, the dealer tested the compression and determined a new engine is needed. 
69000 mi

US $600
Check Engine Light came on. Dealer replaced an intake solenoid. Front brake pads replaced. 
80000 mi

US $900
The coolant overflow tank & radiator were replaced. 
80000 mi

US $800
Replaced fuel pump - leaking at fitting to the fuel line. 
36580 mi

C $120
Misfire at high RPMs - One coil was bad, replaced all 4 coils. 
22000 mi

US $8
Check engine light for vacuum leak - possible gas cap leak 

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2004 Mazda RX-8 4dr Coupe

197-horsepower 1.3L R2 4-speed shiftable automatic RWD

36900.0 mi Replaced spark plugs and ignition coils (all). This was done by the dealer, I was not charged for it. This is also considered regular maintenance. 
42000 mi Engine failed compression test, was lacking power down low so under the Mazda 8y/100,000mi engine warranty was replaced. 
35000 mi Mazda replaced engine under warranty due to carbon build up which greatly reduced horsepower. 
23000 mi

US $1279
Ignition coil failure Decarbonized engine apex seals 
38000 mi

US $250
Check engine light on. Reset, no further problem. 
53000.0 mi

US $300
Engine lost compression; engine + fuel pump replaced under warranty. Plugs and wires replaced at owner's cost. No engine problems since. 
34000 mi

US $300
Poor engine response, especially at low rpm, followed by check engine light after a week or so. 
35000 mi

US $248
There were 2 bulletins for weak engine, reflash and diagnostics. The diagnostics turned up shorted coil (so, driving with 1 rotor). Coil replaced on out of warranty assistance, labor paid by owner. 
46000 mi

US $780
Fuel cap seal weak; engine light on, but car worked. After few days, car didn't start. Diagnostic showed P2070 and P0456. Replaced 2 intake manifold tuning valves. Replaced fuel cap on extended warranty. 
53000 mi

US $400
Weak and slight knocking at mid revs under load. Stuck valve on secondary air intake freed up, engine decarbonized with Mazda kit, slightly corroded ignition wires replaced, coils replaced, air filter replaced. 

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2004 Mazda RX-8 4-door

2-cylinder automatic 2WD

38440 mi

C $350
Flooded engine in cold weather. 

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2003.5 Mazda RX-8 4-door

2-cylinder automatic 2WD

39680 mi

A $30
2nd set of failed IGN coils. Replaced(owner) myself for

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Mazda RX-8 Engine Problems

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