2021 Mazda MAZDA3 problems & reliability
49 owner complaints filed with NHTSA for the 2021 Mazda MAZDA3, alongside 1 safety recall campaign. Last verified Sep 22, 2026. Complaints are unverified reports submitted by owners to the federal Office of Defects Investigation.
Each complaint is counted once (by NHTSA case number), even when it names several components.
1 complaint report injuries (1 injured).
Federal crash records (FARS 2020–2023): 2021 Mazda MAZDA3 vehicles were involved in 16 fatal crashes with 8 occupant deaths. Involvement counts are not adjusted for how many are on the road and do not imply fault or a vehicle defect.
Most reported problems
| Component | Complaints | Share |
|---|---|---|
| Engine → | 18 | 37% |
| Forward Collision Avoidance | 7 | 14% |
| Unknown / Other | 7 | 14% |
| Electrical System | 6 | 12% |
| Air Bags | 4 | 8% |
| Service Brakes | 4 | 8% |
| Lane Departure | 3 | 6% |
| Power Train | 3 | 6% |
| Fuel/propulsion System | 2 | 4% |
| Structure | 2 | 4% |
Component groups as classified by NHTSA. A complaint can name more than one component, so shares may sum to more than 100%.
All 15 reported components →Common symptoms owners describe
Keyword analysis of complaint narratives; one complaint can describe several symptoms.
Complaints by incident year
What owners report
“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 confirm the problem and…”
Power Train · filed Jan 25, 2026
“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.”
Suspension · filed Oct 27, 2025
“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 very helpful with…”
Power Train · filed May 27, 2025
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Technical service bulletins
631 manufacturer communications (TSBs, service campaigns, warranty extensions) are on file with NHTSA for the 2021 Mazda MAZDA3. The 10 most recent:
This Service Alert supersedes the previously issued service alert listed below. The changes are noted in Red text. SA-038/26 06/15/26 DESCRIPTION Some customers may complain about any of the following: 1. Infotainment…
SA-038-26a · Service Bulletin/Repair Instructions · issued Sep 4, 2026
This Service Alert supersedes the previously issued Service Alerts listed below: The changes are noted in Red. Infotainment Reboot With Navigation Card Installed This Service Information is no longer valid. Refer to the…
SA-054-26 · Service Bulletin/Repair Instructions · issued Aug 20, 2026
This Service Alert supersedes the previously issued SA(s) listed below. The changes are noted in Red text. SA-039/26 06/15/26 Mazda Connect Symptom Troubleshooting DESCRIPTION Customers having MAZDA CONNECT concerns…
SA-039-26a · Service Bulletin/Repair Instructions · issued Aug 19, 2026
This Service Alert supersedes the previously issued bulletin(s) listed below. The changes are noted in Red text. SA-006/23 01/23/23 DESCRIPTION Some customers may complain about the infotainment system and/or the…
SA-053-26 · Service Bulletin/Repair Instructions · issued Aug 19, 2026
DESCRIPTION Some customers may complain about SiriusXM Travel Link, Traffic Plus showing expired even though the customer purchased a paid subscription. SiriusXM audio packages do not include SiriusXM Travel Link…
SA-052-26 · Service Bulletin/Repair Instructions · issued Aug 18, 2026
This bulletin supersedes the previously issued bulletin(s) listed below. The changes are noted in Red text. 01-012/22 10/06/22 DESCRIPTION Some vehicles may exhibit accumulation of dried coolant (1) around the water…
01-010-26 · Service Bulletin/Repair Instructions · issued Aug 10, 2026
DESCRIPTION Some customers may complain that the electric power steering warning light illuminates after engine start and DTC U2011:1C is stored. Zinc-plated whisker may form inside the EPS motor and trigger the DTC…
06-001-26 · Service Bulletin/Repair Instructions · issued Jul 8, 2026
This SA supersedes the previously issued SA(s) listed below. The changes are noted in Red. SA-063/24 09/06/24 DESCRIPTION The Blind Spot Monitoring (BSM) system can malfunction with the following symptoms if the rear…
SA-043-26 · Service Bulletin/Repair Instructions · issued Jul 2, 2026
This bulletin supersedes the previously issued bulletin(s) listed below. The changes are noted in Red. 09-016/26 05/06/26 DESCRIPTION Some customers may complain that the seat warmer does not operate when turning the…
09-016-26a · Service Bulletin/Repair Instructions · issued Jul 2, 2026
This Service Alert supersedes the previously issued SAs listed below. The changes are noted in Red text. SA-017/25 12/16/25, 09/08/25, 07/14/25, 05/15/25 and 03/21/25 DESCRIPTION Mazda Connect Frequently Asked Questions…
SA-042-26 · Service Bulletin/Repair Instructions · issued Jul 1, 2026
TSBs are repair guidance manufacturers send to dealers — they are not recalls and repairs are not automatically free. Full documents are available on NHTSA’s site.
Safety recalls
The 2021 Mazda MAZDA3 has 1 NHTSA recall campaign — recall repairs are free at franchised dealers regardless of the vehicle’s age.
Check whether your specific vehicle is affected
Recall campaigns often cover only certain VIN ranges. Enter your VIN on the official NHTSA site to confirm whether your vehicle is included and whether the repair is still open.
Check VIN on NHTSA →Buying a used 2021 Mazda MAZDA3?
- · Decode the seller’s VIN with our free VIN decoder to confirm the exact year, engine and trim.
- · Check for unrepaired recalls by VIN on NHTSA’s official lookup — recall repairs are free.