AI-generated · grounded in NHTSA data
Reliability & 5-year cost of ownership — 2021 Mazda Cx-9
Overall rating NHTSA-grounded
Average
Estimated 5-year repair + maintenance cost: $4,000–$9,000
The 2021 Mazda CX-9 has an average reliability rating, with concerns primarily focused on the engine and brakes, which lead the complaint counts. Potential recall issues with seat assembly further impact its reliability.
Most-common failures
| Part | Typical mileage | Cost range | Frequency |
|---|---|---|---|
| engine | 30,000–50,000 miles | $500–$2,500 | common |
| service brakes | 40,000–60,000 miles | $300–$1,500 | occasional |
| forward collision avoidance | 20,000–40,000 miles | $400–$1,200 | occasional |
Scheduled maintenance to budget
Routine items every owner should plan for.
- oil and filter changes
- brake pad replacement
- tire rotations and balancing
- coolant flush
- transmission fluid change
Warning signs to watch for
Symptoms that signal a major upcoming repair.
- engine misfires or stalling
- reduced braking performance
- unexpected forward collision warnings
Generated by gpt-4o on 8/19/2026. Cost ranges are conservative estimates that account for typical regional variation.