2018 Mazda CX-9 Engine Problems
Owners have filed 76 complaints with NHTSA about engine problems on the 2018 Mazda CX-9, 59% of all complaints for this model year. Half of the reports with a mileage happened before 39,500 miles. The words owners use most often: “cylinder head” (58% of reports).
- 76engine complaints
- 39,500median miles at failure
- 0mention a crash
- 0mention an injury
- 0related recalls
- $8,500typical repair cost reported by owners
- 50%of reports with a speed happened at 50+ mph
What owners describe
Phrases that appear unusually often in these complaints compared with complaints about other cars.
- Cylinder head: mentioned in 44 of 76 complaints (58%)
- Coolant leak: mentioned in 25 of 76 complaints (33%)
- Service bulletin: mentioned in 11 of 76 complaints (14%)
- Said cracked: mentioned in 5 of 76 complaints (7%)
How much does it cost to fix?
Owners who wrote down what they paid or were quoted put the typical engine repair on the 2018 Mazda CX-9 at $8,500, and half of them between $7,850 and $11,100.
Based on 7 NHTSA complaints about this problem alone that state a repair bill or quote (2022–2024), converted to 2026 dollars with the U.S. consumer price index. These are owners' own figures, not a quote: they include dealer quotes, and owners who file complaints often faced larger repairs, so they can run higher than typical shop prices. Prices vary by shop, region and warranty coverage. How we calculate this.
At what mileage do engine problems happen?
Based on 4 complaints that reported the odometer reading.
How serious are the reports?
None of the 76 complaints report a crash, fire or injury.
Mazda CX-9 engine complaints by model year
| Model year | Engine complaints | Share of that year | Median miles |
|---|---|---|---|
| 2021 CX-9 | 21 | 53% | 51,093 |
| 2020 CX-9 | 5 | 26% | 2,200 |
| 2019 CX-9 | 23 | 43% | 43,878 |
| 2018 CX-9 | 76 | 59% | 39,500 |
| 2017 CX-9 | 43 | 70% | — |
| 2016 CX-9 | 68 | 64% | 35,200 |
| 2015 CX-9 | 17 | 49% | 83,874 |
| 2014 CX-9 | 19 | 35% | 91,675 |
| 2013 CX-9 | 17 | 25% | 88,950 |
| 2012 CX-9 | 25 | 11% | 65,000 |
| 2011 CX-9 | 15 | 9% | 81,000 |
| 2010 CX-9 | 23 | 12% | 85,401 |
| 2009 CX-9 | 4 | 7% | 105,344 |
| 2008 CX-9 | 6 | 3% | 120,000 |
| 2007 CX-9 | 3 | 3% | 105,000 |
When owners reported it
Related recalls (0)
No safety recall lists engine for the 2018 Mazda CX-9. A pattern of complaints does not always lead to a recall.
What owners report
Short excerpts of recent complaints, with personal details removed. Full reports are on NHTSA.gov.
While driving at highway speed in heavy rain the oil light suddenly came on followed within 30 seconds by an urgent need to immediately stop the car due to overheating. There was no radiator fluid left due to the sudden and catastrophic structural failure caused by a known manufacturing defect…
My 2018 Mazda Cx-9 equipped with the skyactiv-g 2.5T developed a serious cylinder-head/cooling-system failure. The vehicle began to lose coolant with no apparent external leak and subsequently displayed and engine -overheating warning. It continued to lose coolant after a flush. The Mazda…
I was driving home from work and may car started overheating out of nowhere. I was stuck in traffic and white smoke was exiting my exhaust. I pulled over and all of my coolant leaked out of my car. Took it the shop and they said I had a cracked head and need a whole new engine. I seen that there…
Frequently asked questions
Do all 2018 Mazda CX-9s have engine problems?
No. NHTSA has 76 owner complaints about engine for the 2018 Mazda CX-9 (59% of the 128 complaints for this model year). Complaint data shows that the problem is reported, not how many of all cars sold are affected.
Was there a recall on the 2018 Mazda CX-9 engine?
No recall currently lists engine for this vehicle.
At what mileage do engine problems start?
The median reported mileage is 39,500 miles: half of the reports with a mileage came before that.
How much does it cost to fix engine problems on the 2018 Mazda CX-9?
Owners report a typical cost of $8,500 (half paid between $7,850 and $11,100), from 7 complaints that state a repair bill or quote, in 2026 dollars.
What do owners say about engine problems on the 2018 Mazda CX-9?
The most frequent phrase is “cylinder head”, in 44 of 76 complaints, followed by “coolant leak” (25).
See all 2018 Mazda CX-9 problems or engine problems across all CX-9 years.