There are 2 stored owner reports matching the engine leading-label group for the 2012 Mazda Mazda6 in our NHTSA-sourced dataset. These are unverified consumer reports and may not reflect confirmed defects.
This group counts stored reports whose component label starts with one of this site's matching prefixes, ignoring case. Each matching report counts once within the group. Components mentioned later in the label or only in the narrative are not searched. How component counts work
Loaded 2 of 2 matching reports.
Open the full vehicle complaint log (all categories)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.
NHTSA source checks for this vehicle year
Checks are recorded separately for each dataset, not for the whole page. Dates use UTC. A missing check date does not mean no records exist.
Vehicle import recorded: Apr 28, 2026. This is the stored import date, not confirmation that every source was successfully refreshed.