2004 Mazda RX-8 Mazda RX-8 2004

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2004 Mazda RX-8 repairs by problem area

Engine (58%)

Transmission and Drivetrain (11%)

Brakes and Traction Control (0%)

Suspension and Steering (7%)

Electrical and Air Conditioning (15%)

Paint, Rust, Leaks, Rattles, and Trim (7%)

Other (2%)

Chart based on 220 repairs.
See TSBs and recalls for the 2004 Mazda RX-8.

2004 Mazda RX-8 engine repair cost distribution

$2500+ (5%)

$1000 - $2499 (9%)

$500 - $999 (14%)

$100 - $499 (34%)

< $100 (38%)

Worried about potential repair costs? An extended warranty can provide peace of mind.

Chart based on 108 repair trips. The repair cost chart excludes repairs made under warranty, do-it-yourself repairs, and repair trips that include maintenance.

2004 Mazda RX-8 4dr Coupe

238-horsepower 1.3L R2 6-speed manual RWD

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. 
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. 
177700 mi Replace radiator 
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 
63000 mi

US $175
Replaced rear o2 sensor. 
51000 mi Bad PCM - Replaced under emmisions warranty 
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 
107300 mi

US $40
Fuel pump replaced. 
125200 mi

US $4500
Replaced Engine. 
134000 mi

US $180
Coil failed. Replaced all with new. 
54000 mi

US $103
Engine compression tested below minimum levels. 
56000 mi Engine tested for low compression. 
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 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. 
86300 mi At 85,500 miles clutch was worn out and slipping in higher gears under acceleration. I autocross this car year round so it held up well. Replaced everything as the factory flywheel is unable to be resurfaced. Got Fidanza improved steel one which needed counter weight from automatic to balance it. Also got Stage 1 exedy clutch. Most people wouldn't like it as much stronger springs tends to stall car:) Once apart discovered that my throwout bearing was nearly toast but was still working and not making noise. Every 25,000 miles I replace the plugs and wires. The big tipoff for me that a coil or coils are dying is out of nowhere the car won't fire off like normal. Will take twice as long or more to start over 5 seconds. At 30,000 I replaced the Auto Zone coils. Performance improved. Running car at high revs in 2nd gear and them firing 3x every rotation would be about 3000 x 3 = 9000 firings/minute at 9000rpm due to the +3x ratio of flywheel gear to output shaft. That's a lot of stress on the 4 coils. If I drove the car on the hwy in OD the coils would last a very long time. At least twice as long. 
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. 
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. 
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). 
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 
80600 mi

C $50
Replace SSV vacuum actuator  
2013 mi Dealer reflashed PCM to version "M". Oil/Filter change and tire rotation. 
30097 mi Dealer 4206F recall, replaced plugs and reflashed. Replaced trans and diff fluid. 
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 
122760 mi

C $300
OEM latest revision Mazda coils (made in Japan, not knock-offs) requiring replacement after 25k 
119660 mi

C $60
Vacuum control valve for the SSV intake valve failed/malfunctioned, producing code P0661 - solenoid valve circuit low voltage. Replaced the control valve solenoid (Part #K5T49091) and cleaned the connectors. Runs great now! 
122140 mi

C $25
OBDII scan revealed P0076 (non-displayed MIL) VDI control valve circuit voltage low. Ordered a new vacuum control solenoid online (25$ total) and replaced the part/cleaned electrical connection. Whole job took about 2hrs to complete. After the repair, fuel economy and power were restored to normal. 
71920 mi Mazda recall for potential leak around the fuel pump. 
73275 mi

US $2050
Replace motor, spark plugs, coils, spark plug wires. 
137200 mi

US $1000
Water pump and coolant hose leaking. Water pump and cooling hose replaced Oxygen sensor failed 
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. 
65000 mi

US $560
Car was running very rough with difficulty starting. Had 3 ignition coils replaced. 
90000 mi

US $100
Service engine light and misfire- Failed leading, rear rotor ignition coil 
110000 mi

US $1500
Spark plugs replaced 
112000 mi

US $300
Antifreeze reservoir and hose leaking. 
114000 mi Apex seals failed. 
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 
259000 mi

US $2200
Radiator fans 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. 
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. 
56420 mi

C $300
Fuel pump failure 
38150 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 
65000 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. 
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 
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. 
36580 mi

C $120
Misfire at high RPMs - One coil was bad, replaced all 4 coils. 
35000 mi Both O2 sensors failed within 1 week of each other. Replaced under warranty 
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. 
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. 
62000 mi

US $7800
blown gaskets 
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 
22000 mi

US $8
Check engine light for vacuum leak - possible gas cap leak 
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 
49000 mi

US $200
O2 sensor replaced. wasn't damaged before going in. 
26040 mi

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

$300
Replaced PCM / Main control module 
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. 
38000 mi clogged catalytic converter 
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. 
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 
45000 mi Flash update to ECU 
76000 mi

US $120
Flooded after moving car when it was cold, improper warm up procedure. 
145000 mi

US $3000
complete long-block engine replacement 
146000 mi Fuel tank leak risk remediation 

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2004 Mazda RX-8 4dr Coupe

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

36900 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. 
53000 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. 
23000 mi

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

US $250
Check engine light on. Reset, no further problem. 
35000 mi Mazda replaced engine under warranty due to carbon build up which greatly reduced horsepower. 

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2004 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. 

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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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2004 Mazda RX-8 Engine Problems

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