Risk: A sudden air leak from the tire air valve may cause a loss of vehicle control while driving, increasing the risk of a crash.
The fix and full notice
Fix: Mazda will notify owners, and dealers will replace all four tire air valves with new parts, free of charge. The recall began April 6, 2021. Owners may contact Mazda customer service at 1-800-222-5500 Option 4. Mazda's number for this recall is 4721B.
Mazda North American Operations (Mazda) is recalling certain 2021 Mazda3 and CX-30 vehicles.
NHTSA listing: MAZDA3. Mazda campaign 4721B.
Questions about any of these recalls: call NHTSA's Vehicle Safety Hotline at 888-327-4236 (TTY 888-275-9171) or check your VIN at nhtsa.gov/recalls.
What owners report
The areas named in the 49 owner complaints filed with NHTSA for the 2021 Mazda3. NHTSA does not verify complaints.
Engine18 · 37%
Forward collision avoidance7 · 14%
Most named: automatic emergency braking (4)
Electrical system6 · 12%
Air bags4 · 8%
Brakes4 · 8%
Lane departure systems3 · 6%
Powertrain3 · 6%
Unknown or other7 · 14%
A complaint can name more than one area, so shares add up to more than 100%.
Mazda3 recalls and complaints by model year
The highlighted bars are the 2021 model year. Newer model years have had less time on the road, so their counts are lower. Counting complaints filed in each model year's first three years, the 2019 Mazda3 drew the most (47) and the 2021 drew 31.
Owner complaints
2021: 49 complaintsTap or drag across the chart for other years.
Show as a table
Owner complaints by model year, Mazda3
Model year
Complaints
2016
104
2017
83
2018
108
2019
74
2020
32
2021
49
2022
24
2023
12
2024
12
2025
7
2026
1
Safety recalls
2021: 1 recallTap or drag across the chart for other years.
Show as a table
Safety recalls by model year, Mazda3
Model year
Recalls
2016
6
2017
2
2018
4
2019
6
2020
2
2021
1
2022
0
2023
0
2024
3
2025
1
2026
0
Crash test ratings
NHTSA's 5-Star Safety Ratings for each version it tested. Rollover risk is NHTSA's estimate of the chance of rolling over in a single-vehicle crash.
Tested version
Overall
Frontal
Side
Rollover
Mazda Mazda3 4 DR AWD
Rollover risk 10.1%
Mazda Mazda3 4 DR FWD
Rollover risk 10.1%
Mazda Mazda3 5 HB AWD
Rollover risk 10.1%
Mazda Mazda3 5 HB FWD
Rollover risk 10.1%
Questions
What are the most common 2021 Mazda3 problems?
The areas owners name most often in NHTSA complaints: engine (18), forward collision avoidance (7), electrical system (6). NHTSA does not verify complaints, and one complaint can name several areas.
Is the 2021 Mazda3 safe?
In NHTSA crash tests every tested version of the 2021 Mazda3 earns 5 stars overall. The table above lists each tested version.
How do I check if my Mazda3 has an open recall?
Enter the 17-character VIN from your dashboard, door jamb or registration at nhtsa.gov/recalls. The lookup lists unrepaired recalls for that exact vehicle. Safety recall repairs are free at Mazda dealers.
Sources and method
NHTSA recalls file (NHTSA datasets), dated Sep 27, 2026; every campaign checked against NHTSA's recalls API.
NHTSA owner complaints file, dated Sep 26, 2026. Counted by complaint number, so a complaint naming three components counts once in the total.
NHTSA 5-Star Safety Ratings (NCAP).
NHTSA model names covered: MAZDA3.
Complaint counts are unverified owner reports. They rise with sales volume and time on the road, so compare model years with care. How we build these pages. Spotted an error? Tell us.