AutoUtility currently tracks 49 official NHTSA owner defect complaints for the 2021 Mazda Mazda3. Engine & Cooling issues are the most frequently reported category, appearing in 17 complaints (34.7% of submitted records). Among these NHTSA complaint records, 2 filings cite a crash, 2 cite a fire, 1 reports one or more injuries.
Factual proportion of owner complaints categorized by automotive subsystem in NHTSA records
17 owner complaints submitted to NHTSA ODI for this subsystem.
10 owner complaints submitted to NHTSA ODI for this subsystem.
6 owner complaints submitted to NHTSA ODI for this subsystem.
5 owner complaints submitted to NHTSA ODI for this subsystem.
Representative defect filings submitted by owners to the NHTSA Office of Defects Investigation
"My rear differential case cracked, anytime the four wheel drive system was engaged the entire drivetrain would lock up. Luckily we were only on side roads so going less than 30 mph if we had been on the highway when this happened we could have been in an accident or lost control. The dealer did..."
"At 31,000 miles the control arm lower ball joints are torn on both lower. They must be replaced. This is a safety hazard. This should not be an issue with low mileage on this car."
"I was driving when all the sudden there was a loud bang sound. The differential housing cracked. The when awd is demanded the rear diff was was locking up instead of engaging. Luckily we were just on city streets and not on the highway as this rear wheel locking up could cause a crash. Mazda wasn't..."
"Spontaneous loss of power while driving on highway. Check engine light came on. Speed limited by car. Continues to vibrate especially at idle from cold start. Code P0304 intermittently popping up."
"During the incident, the vehicle exhibited an uncontrollable malfunction—the steering wheel suddenly jerked sharply to the right while accelerating violently, leaving me unable to steer or brake effectively, the car was looking forward. The car ultimately came to a stop upon colliding with a truck..."
Reported defect complaint volume across sibling model years (2020–2025)
| Model Year | NHTSA Complaints | Crash Reports | Safety Recalls | Detailed Report |
|---|---|---|---|---|
| 2020 Mazda Mazda3 | 32 | 0 | 2 | View 2020 Problems → |
| 2021 Mazda Mazda3 Current Page | 49 | 2 | 1 | Current |
| 2022 Mazda Mazda3 | 24 | 1 | 0 | View 2022 Problems → |
| 2023 Mazda Mazda3 | 12 | 3 | 0 | View 2023 Problems → |
| 2024 Mazda Mazda3 | 12 | 2 | 3 | View 2024 Problems → |
| 2025 Mazda Mazda3 | 7 | 2 | 1 | View 2025 Problems → |
Complete distribution of consumer defect reports across all 22 granular NHTSA system and subsystem classifications
| Vehicle Component / System | Total Complaints | Crash Reports | Fire Reports | Injury Entries | Fatality Entries |
|---|---|---|---|---|---|
| Engine NHTSA category: ENGINE | 16 | 0 | 0 | 0 | 0 |
| Air Bags NHTSA category: AIR BAGS | 4 | 1 | 0 | 1 | 0 |
| Other / Uncategorized NHTSA category: UNKNOWN OR OTHER | 4 | 0 | 0 | 0 | 0 |
| Forward Collision Avoidance NHTSA category: FORWARD COLLISION AVOIDANCE | 3 | 0 | 0 | 0 | 0 |
| Powertrain NHTSA category: POWER TRAIN | 3 | 0 | 0 | 0 | 0 |
| Electrical System NHTSA category: ELECTRICAL SYSTEM | 2 | 0 | 2 | 0 | 0 |
| SERVICE BRAKES,FORWARD COLLISION AVOIDANCE | 2 | 0 | 0 | 0 | 0 |
| ELECTRICAL SYSTEM,LANE DEPARTURE | 1 | 0 | 0 | 0 | 0 |
| ELECTRICAL SYSTEM,UNKNOWN OR OTHER | 1 | 0 | 0 | 0 | 0 |
| ELECTRICAL SYSTEM,VEHICLE SPEED CONTROL | 1 | 0 | 0 | 0 | 0 |
| FORWARD COLLISION AVOIDANCE,LANE DEPARTURE | 1 | 0 | 0 | 0 | 0 |
| LANE DEPARTURE,FORWARD COLLISION AVOIDANCE | 1 | 0 | 0 | 0 | 0 |
| Seat Belts NHTSA category: SEAT BELTS | 1 | 0 | 0 | 0 | 0 |
| Service Brakes NHTSA category: SERVICE BRAKES | 1 | 0 | 0 | 0 | 0 |
| SERVICE BRAKES,FUEL/PROPULSION SYSTEM | 1 | 0 | 0 | 0 | 0 |
| STEERING,ELECTRICAL SYSTEM,VEHICLE SPEED CONTROL | 1 | 1 | 0 | 0 | 0 |
| Structure & Body NHTSA category: STRUCTURE | 1 | 0 | 0 | 0 | 0 |
| STRUCTURE,ENGINE,FUEL/PROPULSION SYSTEM | 1 | 0 | 0 | 0 | 0 |
| Suspension NHTSA category: SUSPENSION | 1 | 0 | 0 | 0 | 0 |
| UNKNOWN OR OTHER,ENGINE | 1 | 0 | 0 | 0 | 0 |
| Wheels & Hubs NHTSA category: WHEELS | 1 | 0 | 0 | 0 | 0 |
| WHEELS,UNKNOWN OR OTHER | 1 | 0 | 0 | 0 | 0 |
Cross-reference safety recalls, crash test safety ratings, and EPA fuel economy for this model year
Key performance indicators, EPA fuel economy specs, powertrain variants, and summary ratings.
Official recall campaigns, safety defect descriptions, and manufacturer free remedy instructions.
NHTSA 5-Star NCAP crash test results, driver assistance systems, and rollover resistance ratings.
EPA fuel economy ratings, electric range, and annual energy cost benchmarks.
Direct, deterministic answers synthesized from verified United States government databases for the 2021 Mazda Mazda3
In official NHTSA consumer records, the most frequently cited issue area for the 2021 Mazda Mazda3 is Engine & Cooling, appearing in 17 records (34.7% of submitted filings).
Secondary reported categories include Driver Assistance & Safety Tech (10) and Electrical System (6).
AutoUtility does not issue subjective reliability scores or commercial ratings. In official United States government records, NHTSA tracks 49 consumer defect complaints and 1 safety recall campaign for the 2021 Mazda Mazda3.
Reviewing documented component complaint distributions, recall remedy notices, and active federal investigations provides an objective, evidence-based view of the vehicle's historical safety and defect record.
Among consumer complaint records on file with NHTSA for the 2021 Mazda Mazda3, 2 filings cite a crash, 2 cite smoke or fire, and 1 report one or more injuries.
Incident entries represent consumer descriptions at the time of submission to federal authorities and do not establish mechanical causation or legal liability.
The complaint records on this page are retrieved directly from the NHTSA Office of Defects Investigation (ODI) public database under 49 CFR Part 576.
Local Production Store Compiled: August 2026 • Deterministic Audited Dataset • Zero Dynamic External API Runtime Latency.