Mazda Cx-30, Mazda Mazda3, model year 2021. Filed by Mazda North American Operations and reported to NHTSA on 22 February 2021. 599 vehicles potentially affected.
What the notice says Mazda North American Operations (Mazda) is recalling certain 2021 Mazda3 and CX-30 vehicles. Air may suddenly leak from the tire air valve.
Is your vehicle included? Check with your VIN at NHTSA, or ask a dealer. This page is an independent copy of the notice, kept so you can see what changed after it was published. It is not the authority, and the authority’s own text is the one to act on.
Mazda's own number for this recall: 4721B. That is the number on the owner letter and on the dealer paperwork. 21V101 is the number NHTSA gave the same campaign, and the number this page is filed under. They are one recall, written two ways.
What owners ask about this recall
- Which vehicles does recall 21V101 cover?
- Mazda Cx-30, Mazda Mazda3, model year 2021.
- What is wrong with them?
- Mazda North American Operations (Mazda) is recalling certain 2021 Mazda3 and CX-30 vehicles. Air may suddenly leak from the tire air valve.
- What can happen if it is not put right?
- A sudden air leak from the tire air valve may cause a loss of vehicle control while driving, increasing the risk of a crash.
- Is there a fix yet?
- Yes, and it is free. 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.
- What should I do now?
- Check your own vehicle by its VIN with NHTSA, which is the record to act on. Mazda calls this recall 4721B, which is the number on the owner letter and the dealer paperwork.
Answered from the register this site holds. NHTSA is the record to act on.
What the authority says can happen if this is not fixed: “A sudden air leak from the tire air valve may cause a loss of vehicle control while driving, increasing the risk of a crash.”
affected
in the notice
caught
| Campaign | 21V101 |
|---|---|
| Filed by | Mazda North American Operations |
| System at fault | Tires:Valve |
| Reported to NHTSA | 22 February 2021 |
| Model years | 2021-2021 |
| Vehicles named | MAZDA CX-30, MAZDA MAZDA3 |
What the notice says today
The consequence
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 remedy
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.
What it said before
This campaign is in the register but not yet in the dated wording archive, so we cannot yet say whether its text has moved. It enters the archive on the next pass.
This is one of 455 notices in the record whose component field names tires. Across that group the median wait before owners were written to was 34 days.
The models named here, across their whole recall history
The recall record and its wording are published by the US National Highway Traffic Safety Administration and are US Government public domain. The dated archive, the comparison and any before-and-after above are CarsMultiverse. How fresh every engine behind this page is, is public on the status page. To check a specific vehicle, use NHTSA’s own VIN lookup.
Other Mazda notices we hold
- 25V737: 2025 CX-50 and CX-50 Hybrid
- 25V568: 2024-2025 CX-90 and 2025 CX-70 mild hybrid electric
- 25V418: 2025 CX-50 Hybrid
- 25V413: CX-50 Hybrid and CX-50
- 25V357: 2024-2025 Mazda3 and CX30
- 25V336: 2024-2025 Mazda MX-5
- 25V167: 2024-2025 CX-50
- 24V817: 2024 CX-90 and 2025 CX-70 plug-in hybrid electric
All 99 Mazda campaigns we hold · Every manufacturer in the record
The fingerprint of this notice
We take a SHA-256 of each of the three blocks of text the authority publishes and keep the first eight characters. As we last read campaign 21V101 on 23 August 2026, they were:
- Defect summary
396ef6ed - Consequence
ad8c4847 - Remedy
cae8bbda
We first read this notice on 21 August 2026. It has not moved since. If it ever does, these characters will not match, and the change will be dated here.
The wording we hold for 21V101 · how the whole register is watched
This notice names one vehicle among several registers that have written about it. Every notice this site holds for the Mazda Mazda3, in all seven, is kept on that vehicle's own page, with the newest in each.
Put this notice on your site
A small badge that links here and names the register's reference. It costs one line of HTML and needs no key.
The badge is free to use. It links to this page and nowhere else, and it never shows advertising.
Owners of these cars
No register publishes what happens after the letter. Owners do: tell us, in two taps.
Anonymous: no account, no cookie, nothing you type is stored beyond these choices. Figures appear once 3 owners have answered, and are published with the record under CC BY 4.0.