Low oil warnings
The 2021 CX-30 has about 170 complaints per 100,000 sold, the most of any CX-30. Low oil level warnings lead, followed by battery drain and collision warning faults.
Updated November 2026 · based on 101 owner complaints and 2 recalls
168 1.6x the CX-30 average
2 free to fix at a dealer
Every CX-30 year compared
Owner complaints per 100,000 cars sold. Lower is better. The newest years have had less time to collect complaints, so they are marked too new to judge.
Top problems and what they cost
Oil consumption
Low oil warnings between changes.
Fix: Diagnosis first; engine repairs can exceed $4,000 if not covered
Engine
Battery drain
The battery dies after the car sits.
Fix: Battery $150 to $300
Electrical system
Recalls
If the power liftgate unexpectedly lowers while a person is accessing the rear storage area of the vehicle, it can increase their risk of injury.
A sudden air leak from the tire air valve may cause a loss of vehicle control while driving, increasing the risk of a crash.
Complaints by part
Before you buy a 2021 Mazda CX-30
- Check the oil level on the dipstick.Knocking, ticking or rattling from the engine, especially when cold, can mean worn bearings, lifters or a stretched timing chain. These are engine-out repairs costing thousands.49 of the 101 owner complaints about the 2021 CX-30 involve the engine (49%).
- Ask whether the battery was replaced.Many electrical glitches on these cars trace back to a weak 12-volt battery or a failing alternator. A battery older than about four years is worth replacing.14 of the 101 owner complaints about the 2021 CX-30 involve the electrical system (14%).
Questions
Is the 2021 Mazda CX-30 reliable?
Low oil warnings. The 2021 CX-30 has about 170 complaints per 100,000 sold, the most of any CX-30. Low oil level warnings lead, followed by battery drain and collision warning faults.
How many recalls does the 2021 Mazda CX-30 have?
2 recalls. Recall repairs are free at any Mazda dealer, even for later owners. Enter the VIN on the free government recall lookup to see which are still open on a specific car.
What are the most common 2021 Mazda CX-30 problems?
Oil consumption; Battery drain.
Crash rating shown for the 2021 Mazda CX-30 SUV AWD. Repair costs are typical U.S. ranges for parts and labor, not quotes. How we score.