There are 2 owner-reported engine complaints for the 2012 Mazda Mazda6in NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
WHILE VEHICLE IS IN MOTION THE GEAR INDICATOR ON THE DASH I WILL FLASH IN AND OUT. WHEN THE LIGHT GOES OUT THE VEHICLE WILL STALL AND WHEN IT COMES BACK ON THE VEHICLE WILL REV UP CAUSING AN UNSAFE SPEED. THE ECM WAS REPLACED AND TWO MONTHS LATER THE PROBLEM STILL PERSISTS. THE DEALER CANNOT FIND ANYTHING WRONG
TL* THE CONTACT OWNS A 2012 MAZDA 6. WHILE DRIVING APPROXIMATELY 55 MPH, AN ABNORMAL SOUND EMITTED FROM THE ENGINE COMPARTMENT. THE FAILURE RECURRED MULTIPLE TIMES. THE VEHICLE WAS TAKEN TO A DEALER FOR DIAGNOSTIC TESTING. THE TECHNICIAN DIAGNOSED THAT THE CATALYTIC CONVERTER SEAL RING NEEDED TO BE REPLACED. THE FAILURE RECURRED. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE. THE APPROXIMATE FAILURE MILEAGE WAS 42,000.
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