Built from official NHTSA complaint and recall data · data through 07/14/2026
High complaint levelIts most-reported problem — Engine — runs 4.6× the fleet median for that category across the 2583 model-years tracked on this site.
124Complaints
2Recalls
4Crashes
1Fires
2Injured
0Deaths
Source: U.S. NHTSA complaint & recall data. Complaints are unverified reports from vehicle owners — a complaint is not a confirmed defect.
Is this problem acknowledged?
The most-reported problem — Engine (58.1% of complaints) — has no NHTSA recall or open investigation on file.
Engine complaints here are 4.6× the median for that category across the 2583 model-years tracked on this site.
2 of the 6 most-reported categories on this page are backed by a recall or open investigation; the other 4 rest on owner reports alone.
Complaint category
Reports
Official status
Reference
Engine
72 · 58.1%
No official action
—
Electrical System
15 · 12.1%
Recalled
Recall 19V403000
Power Train
13 · 10.5%
No official action
—
Service Brakes
11 · 8.9%
No official action
—
Fuel/propulsion System
5 · 4%
Recalled
Recall 21V875000
Steering
3 · 2.4%
No official action
—
Recalled = an NHTSA safety recall covers this category, so a free repair exists. Under investigation = NHTSA has an open probe but no recall yet. Investigation closed = NHTSA examined it and closed the probe — this is not a defect finding; where a closed probe led to a recall we name the campaign. Not available = recall or investigation data could not be confirmed for this vehicle — it is not a “no”. Categories are matched by NHTSA's top-level component. Check your VIN at nhtsa.gov/recalls.
Percentages are the share of the 124 complaints citing each component; one complaint can cite several components. “Unspecified / other” is NHTSA’s own catch-all category — we show it rather than hide it.
The passenger frontal air bag may not deploy, increasing the risk of injury. Inoperable turn signals prevent the driver from signaling to other drivers, increasing the risk of crash. Recall repairs are free at authorized dealers.
PARK-IT: NO · PARK-OUTSIDE: NO · OVER-THE-AIR FIX: NO
Park itPark outside Specimen badges — shown on a recall card only when NHTSA sets the flag. None of the campaigns above carries either flag. Always check your own vehicle by VIN at nhtsa.gov/recalls.
What owners report
“. In January 2024, I purchased a used 2018 Mazda CX-9. The vehicle ran well until [XXX], when I discovered an engine coolant leak. My…”NHTSA complaint 11674928 — filed 07/21/2025 · ENGINE
“Our Mazda CX-9, having roughly 86,000 miles, had catastrophic engine failure while driving. This is caused by coolant leaking at the cylinder head and around…”NHTSA complaint 11657829 — filed 04/30/2025 · ENGINE
“Fan is not working and car is overheating when driving in traffic or low speeds - from forums this seems to be a common issue…”NHTSA complaint 11624426 — filed 11/10/2024 · ENGINE
Excerpts are shortened and scrubbed of personal details; they are individual, unverified reports.
Complaint trend by year filed
Frequently asked questions
What are the most common problems with the 2018 Mazda CX-9?
Engine issues are the most-reported category, cited in 72 of 124 NHTSA complaints (58.1%), followed by unspecified/other issues (19), electrical system (15), power train (13). Complaints are unverified owner reports.
How many complaints does the 2018 Mazda CX-9 have?
124 complaints were on file with NHTSA as of 07/14/2026. Of those, 4 involved a crash, 1 involved a fire, and 2 reported injuries. No deaths were reported.
Does the 2018 Mazda CX-9 have any recalls?
Yes — 2 NHTSA safety recall campaigns, including campaign 21V875000. Recall repairs are free at authorized dealers. Check your specific vehicle by VIN at nhtsa.gov/recalls.
Has NHTSA acted on the 2018 Mazda CX-9's reported problems?
2 of the 6 most-reported complaint categories on this page are backed by an NHTSA safety recall or open investigation; the rest are unverified owner reports. A recall means a free repair is available at authorized dealers.
Is a complaint proof of a defect?
No. Complaints are reports submitted by consumers to NHTSA. NHTSA does not verify individual complaints, and a complaint is not proof that a defect exists.
About this data — Complaint figures on this page are consumer reports submitted to the National Highway Traffic Safety Administration (NHTSA), a U.S. government agency. NHTSA does not verify individual complaints; a complaint is not proof that a defect exists, and counts reflect what owners chose to report, not confirmed failure rates. Recall information comes from official NHTSA safety recall campaigns; recall repairs are free at authorized dealers. Always check your specific vehicle by VIN at nhtsa.gov/recalls. CarModelProblems.com is an independent site and is not affiliated with NHTSA or any vehicle manufacturer. Data through 07/14/2026.
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