TL*THE CONTACT OWNS A 2010 MAZDA MAZDA3. THE VEHICLE WAS PARKED AND TURNED ON WHEN IT SHUT OFF FOR APPROXIMATELY FIVE MINUTES. WHEN THE CONTACT ATTEMPTED TO RESTART THE VEHICLE IT WOULD NOT START. THE VEHICLE WAS TOWED TO AN AUTHORIZED DEALER WHERE THEY WERE UNABLE TO DIAGNOSED THE FAILURE. THE FAILURE RECURRED FOUR TIMES. AN AUTHORIZED DEALER WAS UNABLE TO DIAGNOSE THE FAILURE BECAUSE THE VEHI…
2010 mazda Mazda3 engine problems
severe 15 complaints filed with NHTSA · avg repair $3,100
Complaints
15
Recalls
0
Crashes
2
Avg fix
$3,100
What owners are reporting 2 most recent
WITHIN A WEEK AFTER PURCHASING MY 2010 MAZDA 3 S SPORT SEDAN IN OCTOBER, 2018 FROM A USED CAR DEALER IN MIDVALE, UT, THE CHECK ENGINE LIGHT CAME ON. USING A CODE READER, I CONSISTENTLY GET A CODE OF P0421, WHICH INDICATES THAT THE CATALYST EFFICIENCY IS BELOW THRESHOLD. I HAVE HAD 3 AUTO REPAIR SHOPS LOOK AT MY CAR, AND THEY ALL SAY THAT THE CATALYTIC CONVERTER IS NOT OPERATING PROPERLY AND NEED…
Common questions
How serious is the engine problem on the 2010 mazda Mazda3?
It's a meaningful issue. 15 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $3,100.
At what mileage does the engine typically fail?
Mileage data is limited for this issue. Owners report failures across a wide range, suggesting cause is more about driving conditions and maintenance than mileage alone.
What does it cost to fix?
Independent shops typically charge around $3,100 for engine repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to engine?
No active recalls currently cover engine issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Other problem areas on this vehicle
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Severity ratings are derived from reported crashes, fires, injuries, and fatalities.
Repair cost estimates are independent-shop national averages and may differ in your area.
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