Reliability AnalysisBased on known issue patterns, repair cost data, and ownership trends · How we score

2021 Mazda CX-9 Reliability ReportKeepScore 89/100 · top failure points · buy or avoid

89/ 100

KeepScore

LOW RISK

Grade: A-

A premium-feeling, highly reliable three-row SUV that delivers an excellent driving experience with minimal long-term concerns.

Full system breakdown + what I would do

Quick Facts · 2021 Mazda CX-9

  • Scores roughly in line with adjacent Mazda CX-9 years — consistency that often signals a stable platform generation.
  • The system most likely to surface first: infotainment system (minor severity).
  • Has 1 NHTSA recall on record — the most notable involves the seats:mid/rear assembly.

2021 Mazda CX-9: Buy or Avoid?

The 2021 Mazda CX-9 stands as one of the most compelling and reliably built three-row SUVs on the market, offering a near-luxury experience without the associated headaches. Its robust powertrain and well-engineered chassis mean major mechanical failures are rare, making it a smart choice for discerning buyers seeking long-term value and driving enjoyment.

Biggest Strengths

  • Durable Skyactiv-G 2.5T engine (with proper maintenance)
  • Reliable Skyactiv-Drive 6-speed automatic transmission
  • Superior driving dynamics and comfortable ride quality

2021 Mazda CX-9 — Known Trouble Spots

The systems that break first on the 2021 Mazda CX-9. Mileage windows, repair costs, and fix-before-you-buy notes are in the full report.

1
Infotainment Systemminor
2
Engine Intake Valve Carbon Buildupmoderate
3
Power Liftgate Motor/Actuatorminor
Typical mileage, cost ranges, and the exact what-to-check list are in the full report.

Safety Recalls on the 2021 Mazda CX-9

1 recall on record from NHTSA. Check your VIN atnhtsa.gov to see if the repair was performed.

SEATS:MID/REAR ASSEMBLY

Mazda North American Operations (Mazda) is recalling certain 2020-2021 CX-9 vehicles equipped with 60/40 split bench second-row seats. The left-side second-row seat may unexpectedly slide forward during a crash. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 210, "Seat Belt Assembly Anchorages."

What breaks on the 2021 Mazda CX-9?

Full reliability breakdown — engine, transmission, rust, electrical. With repair costs and mileage danger zones.

OwnerKeep Passport · $499 · one-time

Just bought a 2021 Mazda CX-9? Keep it that way.

Snap a receipt — AI logs it. Build an OwnerScore. Sell with a buyer-ready Passport dossier.

Mazda CX-9 — Year-by-Year Comparison

Compare KeepScores across nearby years of the Mazda CX-9. Click any year for its full report.

Competing 2021s Worth a Look

Similar class, similar year range — ranked by KeepScore.

Relevant Products for Your 2021 Mazda CX-9

Parts and accessories matched to your 2021 Mazda CX-9

As an Amazon Associate I earn from qualifying purchases.

Frequently Asked Questions

Full Report

2021 Mazda CX-9

7-system breakdown, mileage danger zones, repair cost projections, buyer checklist, and expert verdict.

Instant delivery · No account

Complete Owner's Guide

Already own one? Get the 13-chapter owner's guide with specs, service schedules, and fluid capacities.

Compare This Vehicle

Final Step

Know every issue before you sign.

A $4.99 reliability report can catch a $3,000 problem. Full breakdown for the 2021 Mazda CX-9 — delivered in under 60 seconds.

OwnerKeep Passport

Just bought a 2021 Mazda CX-9? Keep it that way.

OwnerKeep Passport turns your Mazda CX-9's care history into a luxury digital vault — AI-logged receipts, an OwnerScore that pays at resale, and a buyer-ready dossier in one tap.

  • AI receipt OCR — snap and log
  • Fuel & mileage tracker
  • Tri-Score OwnerScore
  • One-tap resale dossier PDF
$499 · one-time · lifetime access · no subscription