2017 Mazda CX-9

No clear pattern

0% of complaints about the 2017 Mazda CX-9 arrived in its first year of service. That is an unusual figure for a 2017 vehicle, but with only 78 complaints on record the sample is too small to call it a pattern — the margin of error covers the range where ordinary vehicles sit. The figures below are reported without a verdict. The most-reported system is engine (43 complaints), typically at 7.1 yr.

Complaints: 78
Median age at failure: 6.8 yr
Median mileage: 33,500 n=9
Crash / fire / tow: 0% of reports
Safety recalls: 0

In owners’ own words

Engine mileage not reported 5.3 yr in service

Engine has serious manufacturing defects and a recall should recalled. The engine has casting issues which cause internal issues.

Engine mileage not reported 5.7 yr in service

Technician noticed coolant leak around turbo during routine maintenance. Sometimes after long drives we would smell hot coolant but didn't think it was an issue. Dealership took it in for repair under power train warranty and was advised that the engine needs to be replaced. From my understanding, the turbo is too heavy for the engine and has caused it to warp. The coolant leak is a symptom of a damaged engine block.

Engine mileage not reported 6.0 yr in service

Vehicle has only 50k miles and developed a coolant leak which was caused by a crack in the cylinder head. No check engine light or overheating, but this repair will cost was estimated as over $4k. A cracked cylinder head would eventually lead to vehicle overheating which can put driver and passengers in a dangerous situation if vehicle were to overheat while operating as this is a significant engine repair. After dealer technician inspected the part, I was informed that they don't see overheating or poor maintenance as the cause of this issue, but it was caused by the part failing.

Other CX-9 model years

How to read this

This is what owners reported, not a reliability rating. People file with NHTSA about alarming failures, not routine ones, and complaint volume tracks how many cars were sold.
Failure ages come from the incident date on each complaint, populated on about 83% of records. Mileage is shown where reported — NHTSA’s 2021 system change cut mileage capture to roughly 15%, so it thins out sharply after MY2020.
Every rank compares this vehicle only against others of the same model year. A 2025 car has not had time to accumulate five-year failures, so comparing early-failure share across years is meaningless.
Fourteen make-months distorted by media storms and mass recalls — Toyota in February 2010 ran 11× normal volume across 33 models — are excluded.
Recalls are manufacturer actions and authoritative; complaints are not. A recall listed here may already have been performed on any individual car. Check a specific VIN at nhtsa.gov/recalls.

2017 Mazda CX-9

When each system is reported — middle 50% of complaints

In owners’ own words

Other CX-9 model years

How to read this