2018 Mazda CX-9 Engine Problems

NHTSA component category: ENGINE · data through 07/12/2026

72Engine complaints

58.1%Of all 124 complaints

#1Most-reported category

Source: U.S. NHTSA complaint data. Complaints are unverified reports from vehicle owners — a complaint is not a confirmed defect.

How engine ranks on this vehicle

ENGINE72 · 58.1%

Unspecified / other19 · 15.3%

ELECTRICAL SYSTEM15 · 12.1%

POWER TRAIN13 · 10.5%

SERVICE BRAKES11 · 8.9%

Share of the 124 complaints citing each category; one complaint can cite several. Full breakdown on the 2018 Mazda CX-9 overview page.

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

“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

“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

Excerpts are shortened and scrubbed of personal details; they are individual, unverified reports.

Engine complaints by year filed

Frequently asked questions

Does the 2018 Mazda CX-9 have engine problems?

Engine is the most-reported problem area on the 2018 Mazda CX-9: 72 of 124 complaints on file (58.1%). Complaints are unverified owner reports, not confirmed defects.

How many complaints does the 2018 Mazda CX-9 have in total?

124 complaints were on file with NHTSA as of 07/12/2026. Across all categories, 4 involved a crash, 1 involved a fire, 2 reported injuries, and none reported deaths.

What does NHTSA's engine category include?

NHTSA assigns each complaint to standard component categories; this page reports the ENGINE category exactly as NHTSA defines and records it.

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 07/12/2026.