| 1 | 0 | 3 | 4 | 3 | 4 |
2004 Mazda Mazda6 repairs by problem area
Engine (55%)
Transmission and Drivetrain (7%)
Brakes and Traction Control (4%)
Suspension and Steering (9%)
Electrical and Air Conditioning (14%)
Paint, Rust, Leaks, Rattles, and Trim (6%)
Other (3%)
Chart based on 267 repairs.
2004 Mazda Mazda6 engine repair cost distribution
$2500+ (4%)
$1000 - $2499 (9%)
$500 - $999 (18%)
$100 - $499 (32%)
< $100 (37%)
Chart based on 134 repair trips. The repair cost chart excludes repairs made under warranty, do-it-yourself repairs, and repair trips that include maintenance.
2004 Mazda Mazda6
Engine not specified
| 132000 mi US $500 |
Water pump belt tensioner siezed up, causing the engine to over heat. Repair included replacing the tensioner and belt as well as performing a cooling system flush. |
| 86000 mi US $4000 |
Have been taking the car to the dealer for over a year now same problem occurs every time the runs fine then starts to shudder and wont accelerate you have to shut the car off and start it again |
| 86000 mi US $2000 |
Turned out to be electronic throttle system sensors a an b plus a short in wire harness this has stopped intermittent surge and having to shut off car and restart |
| 141980 mi C $500 |
Muffler needed to be repaired. |
2004 Mazda Mazda6 4dr Wagon
220-horsepower 3.0L V6 5-speed shiftable automatic FWD
| 44640 mi C $150 |
TSB 60 for Fan Operation. Previous owner never had repaired this. |
| 49600 mi C $90 |
Heat Shield rusting off on Catalyic Convert. Replace Catalytic Converter Covered under Emission Warranty Car had rattling noise and brake grinding. Shop found some rust on brake, cleaned and lubricated. Rattle was rusted heatshield on catalytic converter. Catalytic converter replaced under warranty. |
| 58900 mi | Cracked exhaust manifold, part replaced |
| 67580 mi C $35 |
Check engine light was after returning home from Vacation. Code check indicated engine misfire. Rough start first time after vacation. No other indications of a misfire since that time. |
| 54560 mi | Worn out coil boots were arcing causing bad hesitation and juddering at most RPM. Replaced coil boots and the engine is smooth. Mechanic replaced spark plugs as well. |
| 53340 mi C $1200 |
Diagnosing/attempting fix of worsening misfire. Replaced 3 rear coil packs, MAF, new intake gasket, etc... This helped alot, but did not resolve the issue completely. |
| 61460 mi | I ended up replacing the coil packs on the front bank and that resolved the misfire. |
| 63240 mi C $485 |
The crankshaft seal was weaping. No oil noticeable on garage floor. Seal replaced. |
| 69440 mi C $2700 |
Weaping water pump Oil pan gasket leaking |
| 45880 mi C $300 |
Oil pan cover. |
| 70680 mi C $550 |
engine light came on. sensor and hose required replacing. also got rear brakes replaced due to wear |
| 89260 mi C $1000 |
Leaking gaskets and oil pan seal |
| 70432 mi | Replaced front catalytic converter due to a crack at the exhaust manifold (covered under the emission warranty) |
| 80160 mi C $100 |
Check engine with the code p0305 came ON - cylinder 5 misfires. Replaced ignition coil |
| 102920 mi C $150 |
Oil leak from the oil pan |
| 99000 mi | Owner identified oil leaks. Vehicle was brought to mechanic and vehicle needed new front and rear main seals and oil pan gaskets. Decided to sell vehicle. |
| 70000 mi US $65 |
Engine idled roughly and engine light came on. Replaced ignition coil. |
| 75000 mi US $65 |
Engine idled roughly and engine light came on. Replaced ignition coil. |
| 103000 mi | Engine was idling rough and engine light came on. Higher RPMs did not have problems. OBD reading said error code was P0171 and P0174, which means engine banks 1 and 2 are too lean. I used cleaner on the MAF and replaced sorta cracked intake. |
| 104000 mi | Engine was idling rough and engine light came on. Higher RPMs did not have problems. OBD reading said error code was P0171 and P0174, which means engine banks 1 and 2 are too lean. Turned out to be cracked PCV hose by firewall. Add fuel system cleaner. |
| 99000 mi US $13 |
Engine idled rough. Check engine light was on. ECU code says bank 1 and 2 are lean and cylinder 5 misfire. Found PCV elbow hose is cracked. Replaced and engine idles better. |
| 114000 mi US $20 |
Rattling under dvr/passenger seats when car started in morning. Goes away as car is driven. Heat shield was rusted, hitting exhaust. Garage removed Heat shield. |
| 117000 mi US $2500 |
Engine replacement |
| 80080 mi C $1100 |
Rear seal leak-had to be replaced. |
| 146475 mi | Sucking noise in engine bay. Wasn't getting a blowjob so it was something else. Used incense stick to find source of leak, then to relax. Found source of leak, cause was a tight c clamp that deteriorated a hose along the pinch. Wrapped it with electrical tape I use for BDSM. I need more tape. |
| 117000 mi US $220 |
A clip had broken off a cooling line and leaked coolant. The radiator was bone dry. Had to replace the clip and refill the coolant. No other issues found. |
| 123500 mi US $1200 |
Water pump seized and took out Serpentine Belt. All had to be replaced along with new idler tensioner. |
| 10005 mi | Replaced defective cooling fan control module under warranty |
| 87000 mi US $800 |
Stalling. Intermittent at first, then got worse. No code at first, then misfire code. First diagnosed as ignition coil, then fuel pump. |
| 87000 mi US $60 |
Intake hose cracked. Led to lean burn fault. |
| 101700 mi C $700 |
Main bearing front |
| 146000 mi US $500 |
coolant got into engine. Just after I replace coils and plugs. Engine is dead. Car was scrapped |
2004 Mazda Mazda6 4dr Wagon
220-horsepower 3.0L V6 5-speed manual FWD
| 100440 mi C $90 |
Coil pack on Cylinder 6 went bad...had been showing symptoms every time the relative humidity took a jump...would start misfiring. |
| 112220 mi C $275 |
Cel displaying catalyst issue. Replaced fouled spark plug, ignition coil, and O2 sensor. |
| 113460 mi C $65 |
CEL still on with P0431 code replaced second, downstream O2 sensor...CEL light came on again after 3 days (nothing more to replace other than pre-cat). |
| 117800 mi C $800 |
after replacing all other components, the cat had to finally be replaced. I supplied the replacement cat and paid labor for the shop to install. |
| 120000 mi US $500 |
hose connected to pcv valve. 2 dollar part, 500 labor to get to the stupid thing! |
| 186000 mi US $200 |
Coils and plugs Intake pipes replaced |
| 215000 mi US $40 |
Cooling fans running all the time |
| 88000 mi US $400 |
Car overheated. Radiator hose replaced. Another part (air intake hose?) also replaced since it looked like it was about to fail, per dealer. |
| 61380 mi | Broken engine mount replaced. |
| 58000 mi US $40 |
Check engine light attributed to loose gas cap. |
| 94000 mi US $280 |
Check engine light on; needed a sensor replaced Replaced rear valve cover gasket to repair significant oil leak |
| 105300 mi | Heatshield rattle, clamped at no-charge while in for OLF. |
| 112000 mi US $550 |
Main bearings worn out and replaced TSB on check engine light on related to a minor leak in evap system; shop advised that dealer will need to clear the code from memory before leak can be fixed & car will pass NJ emissions testing in NOV |
| 144000 mi US $120 |
Thermostat failed, car overheated, pressure buildup blew out sensor. Thermostat & sensor replaced |
2004 Mazda Mazda6 4dr Sedan
220-horsepower 3.0L V6 5-speed shiftable automatic FWD
| 79000 mi US $400 |
The ignition coil went bad and it needed to be replaced as well as all the spark plugs. |
| 134500 mi US $200 |
Check engine light after emissions inspection. |
| 187000 mi US $600 |
Car died suddenly, had it towed in. Diagnosed and had MAF sensor replaced. |
| 197000 mi US $127 |
Vacuum hose was broken. Replaced and was as good as new. |
| 219000 mi US $650 |
During previous oil change the plug had been cross-threaded and when they took it out they stripped out the pan entirely necessitating a pan replacement. Have no proof of who did the last oil change so I had to eat the cost. |
| 204000 mi US $185 |
Check Engine Light came on. Indicated B2S2 oxygen sensor is bad. Chose not to repair at this time. Also had brakes checked - OK. |
| 244000 mi US $994 |
Replaced coil pack Oxygen sensor went bad |
| 62620 mi C $99 |
P431 code; scanned with ScanXL ElmScan tool at home and O2 sensor readout showed a failed bank 2 catalytic converter. Was replaced under warranty (which will run out at then end of this month) |
| 70540 mi C $120 |
The a few ignition coils needed to be replaced, and I also changed a fuel injector. The engine runs like brand new now. No misfires at near max speed. |
| 87080 mi | The engine is leaking oil. Potentially due to an incorrect installation of engine gaskets at a previous time the car was repaired (before I owned it). But it is not so bad that it is dripping on floor. I'm monitoring oil level monthly. |
| 91140 mi C $250 |
The belt tensioner is dying and needed to be replaced, a lot of squealing going on. The squealing is still around, but not as bad as before. The A/C pulley was also making a lot of the noise and needed lubrication. |
| 80600 mi C $1000 |
Camshaft position retarded on bank 1. Car stalls while driving. Cylinder 1 too lean, cylinder 4 rich; random multi-cyclinder misfire. Engine work done before I bought it (I found out when I took it to Mazda dealer). Will need new engine. Sold. |
| 126700 mi US $90 |
Mass air intake hose had to be replaced. |
| 93000 mi US $868 |
Water pump had a leak and was replaced. Also replaced bypass hose as it was swollen. Oil pan was leaking fluid. Leak was sealed with a sealant. |
| 30000 mi | Bad seal on gas cap. Gas cap replaced. Problem solved. |
| 58300 mi | Intermittent hesitation when accelerating. No CEL |
| 67000 mi US $500 |
Bad coil Replaced Air Intake hose (containing multiple sensors) Replaced Ignition Coil on cylinder 5. |
| 68500 mi US $100 |
Replaced failed engine mount |
| 74000 mi US $1348 |
Had to replace coils. Multiple oil leaks requiring replacement of three gaskets. |
| 82000 mi US $1125 |
Bad fan control module |
2004 Mazda Mazda6 4dr Sedan
220-horsepower 3.0L V6 5-speed manual FWD
| 30000 mi | Check Engine Light - traced to faulty fuel filler cap. |
| 83000 mi US $74 |
Car was losing oil at the rate of 1 quart per 800 miles, with no signs of leaks or burnoff in exhaust. Dealer diagnosed a "sticking" PCV valve, which partially worked. Valve was replaced. |
| 61280 mi $270 |
Check engine light was on, had to replace spark plugs and ignition coils. |
| 84320 mi $650 |
Hesitation under load, uneven idle. Valve cover gaskets & spark plugs replaced. |
| 84320 mi $500 |
Hesitation under load, uneven idle. Valve cover gaskets & spark plugs replaced again. Check engine light came back on and problem persists. |
| 157200 mi US $850 |
Throttle body replacement-sensor went bad and the car had no fueling power. Over heating after throttle body was changed. New thermostat still over heating. Hose leaking and other all connectors for coolant. It leads to the throttle body. |
| 166000 mi US $100 |
Breather hose from the intake to the motor. PCV valve |
| 196000 mi US $150 |
Burning oil, oil in spark plug well #1. Valve cover gasket replacement. Plugs and boots replaced |
| 68820 mi | Excessive oil consumption. Dealer said it was leaking valve cover gasket. Turns out that the PCV valve failed as well. Ordered PCV Valve. Took to friend who owns shop to replace PCV Valve |
| 69440 mi C $400 |
Valve cover gasket was leaking. Changed sparkplugs as well since Intake Manifold had to be removed. |
| 71300 mi C $10 |
Drain bolt seal was worn and was no longer effective. Replaced drain bolt. |
| 72540 mi C $250 |
Oil pan gasket was leaking again. (was fixed under warranty in Dec 07). Mazda said it's out of warranty now so they won't do anything. Bought redesigned oil pan and replaced instead of replacing old gasket that will die again in a year. |
| 111700 mi US $129 |
CEL, slight hesitation/loss of power. Air intake hose was cracked. I replaced it. The part was the only cost. |
| 118000 mi US $300 |
Replaced broken motor mount. |
| 124000 mi US $126 |
Blue smoke from exhaust. Appears to have been a blocked PCV valve at this time. |
| 105000 mi US $165 |
Replaced battery, removed rattling heat shield |
| 120000 mi US $120 |
Lower engine mount failed. The rubber had been ripped through. A replacement (aftermarket) mount was installed that has solid urethane instead of rubber. |
| 126000 mi US $300 |
Pulley for the water pump seized. Belt and pulley replaced. Water pump was ok. |
| 135500 mi US $500 |
Oil Leaks. |
| 138000 mi US $1384 |
Precat (exhaust) needed replacing. |
| 109000 mi US $20 |
Got check engine light with engine stuttering, rough idle. Noted simultaneous P0171 & P0174 DTC codes. Discovered "sucking sound" near intake with engine running. PCV hose was cracked/collapsed. Replaced PCV hose and valve. |
| 139000 mi US $16 |
Oil pressure switch leaking. |
| 154000 mi US $300 |
Replaced remaining engine mounts. |
| 156600 mi US $25 |
Belt tensioner froze, plastic pulley disintegrated. Followed suggestions from other owners and removed the belt tensioner completely, and replaced the belt with a stretch-to-fit belt directly between water pump and drive. |
| 161000 mi US $20 |
Replaced lower dog-bone engine mount. |
| 171000 mi US $120 |
Radiator leaking from top joint between plastic/metal. |
| 196000 mi US $30 |
CEL P0441 evap emission purge flow. Cleaned MAF, SeaFoamed intake. |
| 102300 mi US $600 |
CEL P2135 read about the issue and decided to replace the throttle body due to a TSB issued around 2006 |
| 104000 mi US $4000 |
Engine failed. Cause unknown. |
2004 Mazda Mazda6 4dr Sedan
160-horsepower 2.3L I4 5-speed manual FWD
| 68820 mi C $110 |
Engine light on - took to mechanic, they hooked up to computer and said fuel line problem (losing pressure) that needs more investigation to fix. 3 days later light went off on it's own. |
| 67000 mi US $500 |
Muffler had to be replaced due to rust. |
2004 Mazda Mazda6 4dr Sedan
160-horsepower 2.3L I4 4-speed shiftable automatic FWD
| 112000 mi | Muffler broke off. Extensive rust on exhaust system. I decided repair was not worth the cost, given the age and value of the car. |
| 90000 mi US $500 |
Repaired leaking air hose, manifold etc. Engine light on. |
| 68200 mi C $300 |
Check engine light was on, vacuum hose had cracked. It was replaced. |
| 71000 mi US $260 |
purge solenoid replaced, bad vacuum hose |
| 97000 mi US $655 |
Fuel pump |
| 47120 mi | Erratic idle speed, 700 - 2000 rpm. Fixed by software refresh/updates |
| 71920 mi | Erratic RPMs at idle and low speed driving |
| 82460 mi | slightly noisy tensioner on serpentine belt. Tensioner and belt replaced under mazda extended warrnty |
| 96000 mi US $340 |
Engine thermostat replaced |
| 158000 mi US $299 |
Timing chain replaced. Engine warning light still on however. |
| 133300 mi C $3000 |
Engine replaced with used engine due to impending failure of connecting rod (causing loud internal knocking noise) - same diagnosis from two mechanics |
| 197160 mi | No compression cylinder 3. Still running but mechanic suspects blown rings. Sold as is. |
| 143000 mi US $330 |
Wouldn't start in cold weather. Camshaft found to have jumped position due to TCS-induced overrev in deep snow/ice. Camshaft repositioned, problem has not recurred. |
| 196000 mi US $20 |
Stalled at red light and could not be restarted. OBD indicated fuel pressure regulator failure. Part replaced, but car still would not start. Oil discovered in coolant, rust already obvious, car was scrapped. It was a very good car. |
2004 Mazda Mazda6 4dr Hatch
220-horsepower 3.0L V6 5-speed shiftable automatic FWD
| 85000 mi US $1500 |
Cylinder misfire. One of the cylinder was misfiring. Had to change all 6 ignition coils and spark plugs. |
| 114000 mi US $126 |
Had to replace the spark plugs and #4 coil pack |
| 93000 mi US $430 |
Catalytic converter repaired |
| 106000 mi US $650 |
Car was idling rough. The mass air flow tube was cracked. That was repaired and the throttle body and mass air flow sensor were cleaned |
| 106000 mi US $700 |
Rough idling problem persisted after the first fixes. I searched online for the symptoms of rough idling at low rpms and found that it was likely ignition coils and spark plugs. I requested to have those checked |
2004 Mazda Mazda6 4dr Hatch
220-horsepower 3.0L V6 5-speed manual FWD
| 158100 mi US $476 |
Tensioner for water pump belt seized, destroying the belt. Repair consisted on replacing the belt and tensioner, cleaning the residue from the destroyed belt, and topping off coolant. |
| 107000 mi US $2300 |
Replaced rear cat. Replaced valve cover gaskets |
| 125860 mi C $3000 |
catastrophic engine failure leaking seals from duratec V6 causing valvetrain damage and oil blowby oil level critical to check. seals leak as car ages. |
2004 Mazda Mazda6 4dr Hatch
160-horsepower 2.3L I4 5-speed manual FWD
| 104300 mi US $300 |
computer programming problem |
| 122900 mi US $1300 |
replaced the clutch |
2004 Mazda Mazda6 4dr Hatch
160-horsepower 2.3L I4 4-speed shiftable automatic FWD
| 95100 mi US $358 |
Replaced two motor mounts. The car would jump noticably when shifted from park in the morning and during the first few gear shifts. Separately, the transmission light came on after a violent storm, but reset after disconnecting battery. |
2004 Mazda Mazda6 4dr Hatch
| 60000 mi | car stalled out . engine problem .when I bought it I also purchased the extended warranty . so the engine was covered |
| 155000 mi | engine failure |
2004 Mazda Mazda6 4-door
turbocharged 4-cylinder diesel manual 2WD
| 116440 mi $100 |
replaced the engine buffer (made of rubber) |
2004 Mazda Mazda6 4-door
6-cylinder automatic 2WD
| 17000 mi | Car is getting horrible gas mileage, less than 10MPG, was brought to dealer to evaluate engine for the fourth time. Problem still not fixed. |
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