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What 49 owners told NHTSA about the 2021 Mazda Mazda3

These are the actual owner complaints behind this car’s reliability verdict, filed with the federal government, unedited. They’re unverified reports, not confirmed defects: read them as leads for your pre-purchase inspection, not a diagnosis.

All (49)Crash / fire / injury (4)Engine (18)Driver assistance (7)Electrical system (6)Airbags (4)Brakes (4)Lane Departure (3)Transmission & drivetrain (3)Body & structure (2)Fuel system (2)Speed control (2)

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Working with the data? Download all 49 complaints as CSV · fetched from NHTSA July 10, 2026

How to use these: a complaint is one owner’s report, filed voluntarily and published unverified. Patterns matter more than any single story. If several owners describe the same failure at similar mileage, put that system at the top of your pre-purchase inspection list. Back to the full 2021 Mazda Mazda3 verdict →