Subaru Ascent vs Mazda CX-9: which is more reliable?
The Mazda CX-9 is clearly ahead of the Subaru Ascent on the federal record: 84/100 against 70/100 across every model year we score.
The record, side by side
Subaru Ascent
- 7 model years scored
- 1,029 owner complaints on record
- about 29 complaints per year on the road
- 24 recall campaigns, 8 safety-critical
- best year 2025 (87/100) · worst 2019 (32/100)
Mazda CX-9
- 11 model years scored
- 885 owner complaints on record
- about 7 complaints per year on the road
- 19 recall campaigns, 13 safety-critical
- best year 2022 (93/100) · worst 2012 (50/100)
Mean score is the average across model years from 2013 on, where both records are comparable. How the score works.
Year by year: Ascent against CX-9
The comparison that decides the purchase. A nameplate is not one car — a redesign can move the record sixty points inside two years, and the two nameplates rarely move together.
What owners actually complain about
Subaru Ascent
- Electrical System — 289 complaints
- Power Train — 179 complaints
- Visibility/Wiper — 152 complaints
Mazda CX-9
- Engine — 302 complaints
- Service Brakes — 284 complaints
- Power Train — 87 complaints
They do not fail the same way: the Ascent's complaints concentrate in Electrical System, the CX-9's in Engine. That difference matters more to a buyer than the score gap, because it says which repair bill you are taking on.
Years to avoid on each
Subaru Ascent — avoid: 2019, 2020.
Mazda CX-9: no model year scores below 45; the strongest are 2014, 2015, 2016, 2017, 2019, 2020….
A year scores below 45 on complaints per year of exposure and recall campaigns. Every car’s years to avoid.
What each costs today
A recent used Subaru Ascent prices at about $44,100 and a Mazda CX-9 at about $34,200 — the Mazda CX-9 is roughly $9,900 less, and they return 22.0 against 23.0 MPG combined.
Class-level estimates re-priced to your country, not a valuation of one car. Method.
FAQ
Is the Subaru Ascent or the Mazda CX-9 more reliable?
On the NHTSA record the Mazda CX-9 scores 84/100 against the Subaru Ascent's 70/100, averaged across every model year we hold. The Mazda CX-9 carries about 7 complaints per year on the road against 29 for the Subaru Ascent.
Which Subaru Ascent and Mazda CX-9 years should I avoid?
Subaru Ascent: 2019, 2020. Mazda CX-9: no year scores below 45. Each of those scores under 45 out of 100 on complaints per year of exposure and recall campaigns.
What goes wrong on the Subaru Ascent and the Mazda CX-9?
The largest complaint group on the Subaru Ascent is Electrical System (289 complaints); on the Mazda CX-9 it is Engine (302).
Is the Subaru Ascent or the Mazda CX-9 cheaper to own?
A recent used Subaru Ascent prices at about $44,100 and a Mazda CX-9 at about $34,200, before insurance and the maintenance band. Both pages carry the five-year running-cost figure.