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2016 Mazda CX-9: engine and transmission complaints

VERY HIGH COMPLAINT SIGNAL
74%
72 of 99 relevant owner complaints are about the engine, transmission or fuel system

74% of relevant owner complaints filed with NHTSA on the 2016 Mazda CX-9 are about the engine, transmission or fuel system. Well over half of everything owners reported is the drivetrain. That is a severe model-level pattern; every model year we track at this level has a documented failure behind it.

Worse than 94% of the 1,230 model years we track (2010–2023).

NHTSA data checked September 13, 2026
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Drivetrain complaints
72
engine, transmission, fuel
Total complaints
99
this model year
Fires reported
1
owner-reported
Recall campaigns
0
3 crashes · 3 injuries

Complaints by component

ENGINE61 · 62%
ELECTRICAL SYSTEM14 · 14%
SERVICE BRAKES11 · 11%
POWER TRAIN9 · 9%
FUEL/PROPULSION SYSTEM7 · 7%
UNKNOWN OR OTHER6 · 6%

The years either side

2010
28%
49 of 195
2011
26%
38 of 170
2012
21%
40 of 221
2013
39%
22 of 68
2014
47%
24 of 54
2015
63%
19 of 35
2016
74%
72 of 99
2017
80%
49 of 61
2018
68%
82 of 126
2019
47%
25 of 53
2020
too few complaints
2021
61%
22 of 38
2022
too few complaints
2023
too few complaints

Manufacturers fix things mid-generation. A bad year next to a clean one is common; the fix usually arrived in between.

Cleaner alternatives

Same car, a better year

Other midsize SUVs with no elevated signal in 2016

The percentage is each model year's drivetrain complaint share. No elevated signal describes the model year, not any one car; a well-kept example of a flagged model can still be the right buy, and any of these still needs an inspection.

What owners reported

POWER TRAIN,STRUCTURE10/15/20191 INJURED
DRIVER STOPPED VEHICLE IN A DRIVEWAY WITH MINIMAL SLOPE, SHIFTED THE VEHICLE IN PARK, TURNED OFF THE VEHICLE AND EXITED. DRIVER PROCEEDED TO REAR PASSENGER DOOR TO RETRIEVE 1 YEAR OLD FROM CAR SEAT. AFTER RETRIEVING CHILD FROM CAR SEAT, DRIVER FELT REAR PASSENGER DOOR PUSHING INTO HER LEG, BACK AND HEAD. VEHICLE PROCEE…
ENGINE11/03/2025
In June of 2022 I started having a strong antifreeze/engine coolant smell inside the cab of my vehicle and also outside the vehicle. I had the car checked for a radiator leak, but there wasn’t one. I took my car into my local Mazda where they found that the engine coolant was leaking into the heads of the engine. Mazda…
ENGINE12/27/2024
Engine failure with crack in the engine after a loss of coolant fluid.

Three of 72 drivetrain complaints. The full report shows more, with quotes about the engine in the car you are looking at first.

Before you buy a 2016 Mazda CX-9

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Experimental model-level information. This is not a vehicle inspection, vehicle-history report, financial advice or purchase recommendation. It describes patterns across a model year, not the condition of any individual vehicle.