2021 Mazda Cx-9: Problems & Reliability
SOLID2021 Mazda CX-9: SOLID — 41 owner complaints (1.29 per 1,000 sold), a typical complaint rate for ~5 years on the road; top issue: engine (21 complaints).
CarWhere's verdict score for the 2021 is 1.03, where 1.00 is a typical CX-9 year once complaints are weighted for severity and spread over time on the road, between the best line (0.75) and caution (1.25). Severity drives it: 76% of those complaints report a crash, fire or injury or involve a safety-critical system (engine, powertrain, steering, brakes or fuel).
Sources: NHTSA owner complaints (ODI), recall campaigns and manufacturer service bulletins, published U.S. sales, CarWhere verified buyer prices · Model years 2012–2023 compared · Updated 2026-11-07 · By CarWhere Research · Methodology
41
NHTSA complaints
1.29
Complaints per 1,000 sold
413
Service bulletins
1
Recall campaigns
Most-reported 2021 Mazda CX-9 problems
Engine dominates the record — 51% of complaints name it.
| Component | Complaints | Share of 2021 complaints |
|---|---|---|
| Engine | 21 | 51% |
| Unknown or other | 6 | 15% |
| Powertrain / transmission | 5 | 12% |
| Forward collision avoidance | 4 | 10% |
| Service brakes | 4 | 10% |
A complaint can name more than one component, so shares can add up to more than 100%.
2021 Mazda CX-9 recalls
1 recall campaign on federal record for the 2021 (reported Sep 27, 2021).
| NHTSA campaign | Reported | Component |
|---|---|---|
| 21V750000 | Sep 27, 2021 | Seats › Mid/rear assembly |
2021 Mazda CX-9 service bulletins
The manufacturer has filed 413 technical service bulletins with NHTSA for the 2021 — more than the 320 of the median CX-9 year from 2012 to 2023. Coded bulletins most often cover electrical system (193), engine & cooling (59), equipment adaptive/mobility (51). Bulletins are repair instructions for dealer technicians, not recalls.
The 2021 vs. the year before and after
From the 2020 to the 2021, owner complaints jumped 2.2× (19 → 41) — a step backward. The 2022 that followed fell by more than half (41 → 11), so the 2022 has the lighter record so far.
| Model year | Verdict | Complaints | Bulletins | Recalls | Avg. buyer-paid |
|---|---|---|---|---|---|
| 2020 CX-9 | BEST | 19 | 323 | 1 | — |
| 2021 (this page) | SOLID | 41 | 413 | 1 | — |
| 2022 CX-9 | TOO FEW REPORTS | 11 | 268 | 0 | — |
Prices are averages of CarWhere verified buyer transactions (shown when 3+ deals exist for the year). Full year-by-year table: Mazda CX-9 years to avoid.
What to check on a used 2021 Mazda CX-9
Engine (21 complaints on the 2021): cold-start it yourself and listen for ticking or knocking; check for oil leaks, low coolant and a lit check-engine light, and ask for oil-change records.
Powertrain / transmission (5 complaints on the 2021): test-drive from cold through every gear and feel for slipping, harsh or delayed shifts and shudder; ask whether the transmission fluid has been serviced.
Forward collision avoidance (4 complaints on the 2021): ask about false automatic-braking events and look for driver-assist warning messages.
Service brakes (4 complaints on the 2021): check pedal feel, pulling and grinding, look at rotor and pad wear, and ask when the brake fluid was last changed.
Speed control / throttle (3 complaints on the 2021): check for surging, hesitation or a reduced-power warning, and test cruise control.
Recalls: confirm the campaign above was completed on this VIN.
Nearby CX-9 years with a better rating: 2020.
Know what to pay for the right 2021 Mazda Cx-9 — then negotiate it
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FAQ
Is the 2021 Mazda CX-9 reliable?
2021 Mazda CX-9: SOLID — 41 owner complaints (1.29 per 1,000 sold), a typical complaint rate for ~5 years on the road; top issue: engine (21 complaints). CarWhere's verdict score for the 2021 is 1.03, where 1.00 is a typical CX-9 year once complaints are weighted for severity and spread over time on the road, between the best line (0.75) and caution (1.25).
What are the most common 2021 Mazda CX-9 problems?
By NHTSA owner complaints, the most-reported areas on the 2021 Mazda CX-9 are engine (21, 51%), unknown or other (6, 15%), powertrain / transmission (5, 12%). The manufacturer has 413 service bulletins on file for this model year.
How many recalls does the 2021 Mazda CX-9 have?
1 recall campaign on federal record for the 2021 Mazda CX-9, most recently 21V750000 (Sep 27, 2021, seats). Recall completion is VIN-specific, so check the exact car.
How do I check a specific 2021 Mazda Cx-9 before buying?
Decode the VIN free at carwhere.com/tools/vin-decoder to confirm the build, then run the $9.99 CarWhere Full VIN Report for the exact VIN — recall, complaint, and service-bulletin record for this model year, the original window sticker where the manufacturer publishes one, and a market price check from verified buyers. One-time purchase, no subscription.
Sources & method
Complaint, recall and service-bulletin counts for the 2021 Mazda CX-9 come from NHTSA's Office of Defects Investigation; the per-1,000 rate divides complaints by published U.S. 2021 calendar-year sales; the verdict is CarWhere’s severity-weighted, time-on-road-adjusted score compared with the model’s own median year. Complaints are owner allegations, not verified defects. Full methodology.