Most common 2021 Mazda Mazda3 problems
Share of the 54 complaints; one complaint can involve more than one system. "~" is the median mileage when the problem started.
Mazda Mazda3 complaints by model year
Best Mazda3 years: 2023, 2020, 2024. Years to avoid: 2010, 2012, 2008. Compare all years →
2021 Mazda Mazda3 recalls (1)
Tires › Valve
Mazda North American Operations (Mazda) is recalling certain 2021 Mazda3 and CX-30 vehicles. Air may suddenly leak from the tire air valve.
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.
What 2021 Mazda Mazda3 owners say
Engine & cooling
The thermostat malfunctioned on this vehicle, resulting in the thermostat remaining open and providing excess coolant to the engine, which in turn damaged internal components of the engine (compromises safety), decreased fuel economy, increased emissions (compromised safety), and decreased the life of the engine within the vehicle. It is available for inspection upon request. The vehicle has been inspected by an independent mechanic and will be inspected by the Mazda dealership in 7 days. There were no prior warnings until the engine malfunction notice appeared, the vehicle began to make jolts and stuttering sounds, and the temperature gauge within the vehicle failed to rise to optimal range. …
Experiencing a known excessive oil consumption issue. Low engine oil warning light came on and upon checking, oil was low. This occured at 4000 to 4200 miles. It occured again about 4000 miles later and again at a similar interval. I notified the dealer and scheduled a repair date but I am concerned of other possible damage that may have already occured due to this issue. An oxygen sensor needs to be replaced and is most likely due to the engine malfunction. The cause of the consumption is said to be damage to the valve seals on the exhaust side.
Driver assistance
When this feature is left on in my vehicle, it will detect curves, vehicles, and objects that are not there, and as a result, will attempt to turn my steering wheel (safety concern). I have had to keep this feature turned off to prevent it wrecking the car, because I could be on a straight road, and it will detect a curve that isn't there and begin turning the wheel, which could result in a fatal accident if not corrected and disabled by the driver. It is available for inspection upon request. As the dealer has not driven the vehicle, they have not recreated the error, however if anyone were to drive the vehicle, they would be able to observe the malfunction. The dealer has been made aware on many occasions, though they never documented it and only suggested that I turn the feature off, which automatically turns itself on upon ignition. …
The error code "B14FO-76 FORWARD SENSING CAMERA DEVIATION - WRONG MOUNTING POSITION" was discovered, and verified, by a Safelite Auto Glass service center when the 2021 Mazda 3 was in for a repair (stone chip) to the windshield on September 21, 2021. There were no warning messages nor lights to alert the driver as to the improper installation/mounting of this device. There has been no known modification to nor obstruction of the FSC -- its condition is now as it was received new from the dealer. Improper mounting ("Wrong Mounting Position") of the Forward Sensing Camera affects multiple safety systems of this vehicle, which affects the safety of the vehicle's passengers as well as everyone's safety around the vehicle every time it is driven -- there's no telling what injury and damage may occur from an errant un-commanded driving tasks such as emergency braking and faulty lane departure …
Electrical system
The contact owns a 2021 Mazda Mazda3. The contact stated that while driving at various speeds the passenger front side tire was flat which caused the contact to veer to the shoulder. The contact towed the vehicle to the dealer where the tire was inspected as the technician informed the contact that the tire was on backorder and no replacement tire was available. The vehicle then was towed back to the contact resident however was informed by the towing company that the vehicle abrupted in flames on the flatbed. The fire department was contacted and extinguished the flames. No police report was made. no injuries were sustained. The contact is awaiting approval from the insurance adjustor on adjustments needed to be made for the vehicle. The manufacturer was not notified of the failure. The failure mileage was approximate 2,509.
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 parked diagonally in front of me. After impact, I observed that the front tires remained stuck in a turned-right position, with the steering wheel also locked in that position. This was not an isolated event. Multiple reports from Mazda owners describe similar experiences with their vehicles unexpectedly veering to the right and accelerating without driver input. Given these recurring reports and my own experience, I strongly suspect that a manufacturing defect-whether mechanical, electronic, or software-related-may have contributed to this accident.
2021 Mazda Mazda3 engines & fuel economy
| Engine | Transmission | Drive | MPG city / hwy / combined |
|---|---|---|---|
| 2.0L 4-cyl | 6-speed automatic | FWD | 28 / 36 / 31 |
| 2.5L 4-cyl | 6-speed automatic | FWD | 26 / 35 / 30 |
| 2.5L 4-cyl | 6-speed automatic | 4WD | 25 / 33 / 28 |
| 2.5L 4-cyl | 6-speed manual | FWD | 24 / 33 / 27 |
| 2.5L 4-cyl turbo | 6-speed automatic | 4WD | 23 / 32 / 27 |
EPA ratings. Class: Compact car.
Frequently asked questions
Is the 2021 Mazda Mazda3 a good car?
Based on 54 owner complaints filed with NHTSA, the 2021 Mazda3 rates average: 31% fewer complaints than a typical year of the Mazda3 at the same age. Complaint counts don't account for sales volume or individual maintenance, so have any used car inspected before buying.
What is the most common problem with the 2021 Mazda Mazda3?
The engine & cooling — 19 complaints, 35% of all complaints for this model year. Next are the driver assistance (8) and electrical system (7).
How many recalls does the 2021 Mazda Mazda3 have?
There is 1 recall for the 2021 Mazda Mazda3, the most recent from February 22, 2021 (valve). Recall repairs are free at any authorized dealer — check whether yours has been done with the VIN recall check.
What are the best and worst years of the Mazda Mazda3?
The best years by complaints, compared at the same age, are 2023, 2020 and 2024. Years to avoid or approach with caution: 2010, 2012 and 2008. See the full Mazda Mazda3 years comparison.
At what mileage do 2021 Mazda Mazda3 problems happen?
The median mileage reported in complaints is about 2,000 miles; 100% of problems with a recorded mileage started before 50,000 miles.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.