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.
- • Total NHTSA Complaints: 49 reports
- • #1 Reported Problem Area: Engine & Cooling (17 reports • 34.7% of submitted complaints)
- • Secondary Problem Areas: Driver Assistance & Safety Tech (10), Electrical System (6)
- • Crash-Citing Complaints: 2 filings
- • Fire-Citing Complaints: 2 filings
- • Complaints Reporting Injuries / Fatalities: 1 injury filings • 0 fatality filings
Most Reported Problems for 2021 Mazda Mazda3
Top automotive subsystem defect categories ranked by unique owner complaint volume in federal records
Engine & Cooling
Driver Assistance & Safety Tech
Electrical System
Air Bags & Restraints
Brakes & Traction Control
Recent NHTSA Owner Reports for 2021 Mazda Mazda3
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..."
Complaint History for Mazda Mazda3
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 → |
Detailed NHTSA Component Breakdown for 2021 Mazda Mazda3
Complete distribution of consumer defect reports across all 22 granular NHTSA system and subsystem classifications
| Vehicle Component / System | Total Complaints | Crash Reports | Fire Reports | Reported Injury Entries | Reported 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 |
The complaint records on this page are retrieved directly from the NHTSA Office of Defects Investigation (ODI) public database.
Local Production Store Compiled: August 2026 • Deterministic Audited Dataset • Zero Dynamic External API Runtime Latency.