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2004 Mazda Mazda6 Engine Problems

155 TrueDelta members own (or used to own) a 2004 Mazda Mazda6. 41 of these members (26.5%) have reported engine repairs for their car. A total of 101 engine repairs to 2004 Mazda Mazda6s--an average of 0.7 per vehicle--have been reported.

See our lemon odds and nada odds page to see vehicles with no repairs or vehicles with more than three repairs. To see how frequently 2004 Mazda Mazda6 problems occur, check out our car reliability stats.

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Chart based on 199 repairs.

2004 Mazda Mazda6 engine repair cost distribution

Chart based on 63 repair trips. The repair cost chart excludes repairs made under warranty, do-it-yourself repairs, and repair trips that include maintenance.
Non-members can see only ten 2004 Mazda Mazda6 repair histories. Log in or join us to see them all.

2004 Mazda Mazda6 4dr Wagon

220-horsepower 3.0L V6 5-speed shiftable automatic FWD

45880 mi C $300 Oil pan cover. 

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2004 Mazda Mazda6 4dr Wagon

220-horsepower 3.0L V6 5-speed manual FWD

58000 mi US $40 Check engine light attributed to loose gas cap. 
94000   Check engine light on; needed a sensor replaced Replaced rear valve cover gasket to repair significant oil leak 
104000   Heatshield rattle, clamped at no-charge while in for OLF. 
112000   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   Thermostat failed, car overheated, pressure buildup blew out sensor. Thermostat & sensor replaced 

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2004 Mazda Mazda6 4dr Sedan

220-horsepower 3.0L V6 5-speed shiftable automatic FWD

80000 mi US $400 The ignition coil went bad and it needed to be replaced as well as all the spark plugs. 
30000   Bad seal on gas cap. Gas cap replaced. Problem solved. 
58700   Intermittent hesitation when accelerating. No CEL 
67000 US $500 Replaced Air Intake hose (containing multiple sensors) Replaced Ignition Coil on cylinder 5. 
69000   Replaced failed engine mount 
74000   Had to replace coils. Multiple oil leaks requiring replacement of three gaskets. 
82000   Bad fan control module 

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2004 Mazda Mazda6 4dr Sedan

220-horsepower 3.0L V6 5-speed manual FWD

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 C $400 Valve cover gasket was leaking. Changed sparkplugs as well since Intake Manifold had to be removed. 
71300   Drain bolt seal was worn and was no longer effective. Replaced drain bolt. 
72540   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. 

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2004 Mazda Mazda6 4dr Sedan

160-horsepower 2.3L I4 5-speed manual FWD

67000 mi US $500 Muffler had to be replaced due to rust. 
68820 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. 

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2004 Mazda Mazda6 4dr Sedan

160-horsepower 2.3L I4 4-speed shiftable automatic FWD

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 
198400   No compression cylinder 3. Still running but mechanic suspects blown rings. Sold as is. 
47120   Erratic idle speed, 700 - 2000 rpm. Fixed by software refresh/updates 
71920   Erratic RPMs at idle and low speed driving 
82460   slightly noisy tensioner on serpentine belt. Tensioner and belt replaced under mazda extended warrnty 

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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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