2016 Mazda CX-9

The dominant complaint pattern for the 2016 Mazda CX-9 centers heavily on the engine, which accounts for the majority of reports filed. Owners consistently describe cracked cylinder heads leading to coolant leaks, coolant mixing with oil, and overheating, often without warning. Several owners report noticing a strong coolant smell inside and outside the cabin before any warning light appeared, while others describe sudden loss of power accompanied by white smoke from the engine compartment and coolant spraying into the engine bay. Combustion gases bleeding into the cooling system and crankcase are a recurring detail across multiple reports. Electrical system and powertrain complaints appear in a smaller share of filings but generate far fewer reports and no single clear pattern at the same scale. The cylinder head and coolant leak issue is by far the most consistently described problem, showing up across a range of mileages and often resulting in significant engine damage before owners realized something was wrong.