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EnginePart report

2004 Mazda MAZDA6 Engine Problems

Complaints
7about this part
Share
4%of 160 total for the year
Median mileage
58,327miles
Trend
Not enough dataFewer than 15 complaints, too few for a reliable trend.

NHTSA recorded 7 complaints about the engine of the 2004 Mazda MAZDA6, 4% of the 160 complaints for this model year. Where a mileage was given, the median is 58,327 miles. 1 a fire, according to the filers.

Fewer than 15 complaints name this part, so treat the figures as a rough indication only.

Example complaints

Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.

“I bought this car for 3,000 from the owner had it for 2 months, got oil and all fluids changed. When I was leaving my house a block away it totally died on me and now it wont start at all. I am very frustrated because I dont have the money to buy abother one. Or even repair it.”

NHTSA complaint #11344097, filed 2020-08, 1 miles

“Engine started knocking out of no where really lost power it spun the bearing and rod in the engine its the 2.3 liter engine Mazda has had several complaints about this from 2004 to 2006 I have several people that have had the same issue like I said could cause major accidents it was not low on oil and was not ready for its maintenance Mazda needs to be held accountable for this.”

NHTSA complaint #10644994, filed 2014-10, 139,000 miles

“The v6 motor in my Mazda 6s has been leaking oil for almost 10 of the 12 years I've owned it. The oil leaks out of the faulty seals on the timing chain cover in front of the passenger, and the oil drops onto the catalytic converter. This oil vaporizes and that vapor enters the cabin in slow speed driving and when stopped at intersections. I complained about a burning oil smell many times while the car was still under warranty, and the Mazda service techs always pretended like they didn't find any problem. …”

NHTSA complaint #10862115, filed 2016-04, 40,000 miles

“Re: Mazda 6 v6 made in the ford/Mazda auto alliance factory in flat rock, mi. The miles/speed I listed are actually n/a - this is an ongoing problem that has existed for most of the 10 years I've owned this car. I complained about smelling burning oil coming into the car's cabin since the car was only 1 year old, but the Mazda repair techs appeared to never notice the smell . It was more than a year or so after my warranty ended - despite a dozen instances of complaining to Mazda dealers of this smell - that I realized my problem was oil leaking from my v6 motor's timing chain cover. …”

NHTSA complaint #10586385, filed 2014-05, 30,000 miles

“The way the catalytic converter is designed on cylinders 1, 3,and5 it gets clogged but buy than your rings and bearing have overheated destroying your engine with in a thousand miles of replacing the catalytic converter you find this out. I was driving home the engine was at normal temp driving fine.. Than the car would not go over five MPH. Had it towed to the local grage. 1 of the catalytic converters was clogged on cylinders 1, 3 and, 5 had it replaced plus and oil change. …”

NHTSA complaint #10577530, filed 2014-04, 76,654 miles

Related service bulletins

Engine: other model years

YearComplaintsShare of year
20211376%
2019117%
20183255%
201747%
201679%
201547%
20141511%
201222%
201132%
201042%
2009113%
200822%
200796%
2006106%
200543%
200474%
2003106%

Other parts of the 2004 Mazda MAZDA6

Air bags
55 complaints
Transmission and drivetrain
19 complaints
Body and structure
15 complaints
Electrical system
13 complaints
Brakes
11 complaints
Engine cooling
11 complaints
Latches, locks and linkages
10 complaints
Exterior lighting
7 complaints
Vehicle speed control
7 complaints
Fuel system
6 complaints
Other or unknown
5 complaints
Visibility (wipers, defrost, mirrors)
5 complaints

← All problems reported for the 2004 Mazda MAZDA6

About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 27, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.

To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology