2021 Mazda CX-9 Problems: 2 Known Issues
2021 model year · 750+ owner reports · Updated October 2026
According to Au7o's analysis of 750+ owner reports, the 2021 Mazda CX-9 has 2 documented known issues. None of the listed issues is rated critical; this is not a complete reliability assessment. The most commonly reported issue is Power Liftgate Failure with 750 owner reports. Across all issues with published estimates, repair costs range from $300 to $900. DIY maintenance guides at au7o.io.
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All 2 Known Issues
NHTSA Recalls3 recalls
FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP
Mazda North American Operations (Mazda) is recalling certain 2018 Mazda3, Mazda6, 2019 CX-3, 2018-2019 MX-5, CX-5, CX-9, and 2019-2020 Mazda2 vehicles. The impeller inside the low-pressure fuel pump may crack and deform, potentially causing the fuel pump to fail.
TIRES:TREAD/BELT
Mazda North American Operations (Mazda) is recalling certain 2019 CX-9 vehicles equipped with Sumitomo Falken ZIEX CT50 A/S tires, size P255/50R20 104V, having date code 1619. An incorrect rubber compound may have been used in the tire's manufacturing, allowing the tread to separate and detach.
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."
Enter your VIN at NHTSA.gov to check recalls specific to your vehicle.
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Frequently Asked Questions
What are the most common Mazda CX-9 problems?
According to Au7o's analysis of 750+ owner reports, the 2021 Mazda CX-9 has 2 documented issues. The most frequently reported are: Exhaust valve-seal oil consumption — certain 2021 CX-9 2.5T, Power Liftgate Failure. None are rated critical, but regular maintenance is recommended.
Is the Mazda CX-9 reliable?
The 2021 Mazda CX-9 has 2 known issues documented across 750+ owner reports. None of the matching records is rated critical; this is not a complete reliability assessment. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
How much does it cost to fix common Mazda CX-9 problems?
Repair costs for known Mazda CX-9 issues range from $300 to $900, depending on the specific problem and whether you choose DIY or professional repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What is the 2021 Mazda CX-9 Exhaust valve-seal oil consumption — certain 2021 CX-9 2.5T?
Mazda documents increased oil consumption from damaged exhaust valve seals, with low-oil warning and possible P250F:00. The CX-9 scope is certain 2021 2.5T vehicles: US/Canada 10.25-inch-display VINs JM3TC******509027–541070 (October 6, 2020–September 13, 2021), or Canada/Mexico… Severity: medium.
What is the 2016-2023 Mazda CX-9 Power Liftgate Failure?
The power liftgate system fails to open, close, or hold position. Causes include liftgate strut motors wearing out, latch mechanism failure, and wiring harness damage in the rubber boot between body and liftgate. Cold weather exacerbates the issue as struts lose gas pressure. Repairs typically run $300-$900. Severity: low.
Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.