There are 2 owner-reported engine complaints for the 2007 Mazda CX-9in NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
Coolant was leaking into my engine where the oil goes and I was unaware. The vehicle stalled in me while driving because of this. Even after figuring out what the issue was and trying to have it fix it became inoperable.
ENGINE OSCILLATION WHEN AT IDLE IT OSCILLATES MORE THAN 400 RPM WHEN THE COMPRESSOR COMES ON, AND SOMETIMES THE ENGINE QUITS BECAUSE THE RPMS DROP MORE THAN 400. *TR
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
Data synced from NHTSA on Apr 26, 2026