2021 Mazda CX-9 Engine Problems
- Complaints
- 21about this part
- Share
- 53%of 40 total for the year
- Median mileage
- 51,093miles
- Trend
- StableComplaints filed in the last 3 full calendar years are within 25% of the 3 years before.
NHTSA recorded 21 complaints about the engine of the 2021 Mazda CX-9, 53% of the 40 complaints for this model year. Where a mileage was given, the median is 51,093 miles. 1 of these say a crash was involved, according to the filers.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“The vehicle was parked stationary in the driveway with the engine running for 3-5 minutes with the A/C on. The vehicle then accelerated forward into my garage causing damage. Once I entered the vehicle, both the dash and shifter displayed park. Current TCU system internal failures have been reported from the pulling of data from Mazda.”
NHTSA complaint #11755863, filed 2026-08“I just purchased this vehicle 2 months ago. Yesterday my oil light came on, I pulled over and checked the oil it was completely low. I had to put a quart of oil in it. After that I did some research and learned this seems to be an issue with some 2021 models the cx9 included. There needs to be a recall on this and Mazda needs to fix this issue. These cars cost way to much to have to put a quart of oil every month.”
NHTSA complaint #11563032, filed 2024-01“This complaint refers to Mazda and it's dealer refusal to properly execute the warranty work under the SSPD5 Valve Stem Seal Class Action Campaign and does not follow the Court's approval of the final Settlement Agreement. I assert that Mazda and it's dealer are not following the SSPD5 repair procedures. 1. I have documentation and complaints going back to Dec-2023 with this particular dealer that I have experienced low level oil consumption within the 7,500 mile oil change interval. The dealer did not detect oil leaks in any of the engine systems. 2. …”
NHTSA complaint #11749820, filed 2026-07“I purchased this vehicle June 5 2021. The vehicle has approximately 9150 miles at this time. I changed the oil the first time at 3222 miles just because it was new and I wanted to have a starting point on oil changes. The car has an app you load on your cell phone for messages. The first time I received a massage that the engine was low of oil was around 6700 miles. I checked it and it was low with at the add oil mark with 3500 miles driven. I received a second message from the app stating the oil was low. …”
NHTSA complaint #11468396, filed 2022-06“1000 miles before first ever oil change was needed (according to window sticker provided by Mazda) the low engine oil light came on. The oil was low and needed to be toped off and brought directly to dealer for oil change. The same thing happened again 1300 miles before second oil change was required. It became obvious that the brand new vehicle was burning oil for some reason. The dealership tried to tell us that it was because the car was a turbo. We weren’t buying it and told them we wanted it looked at. …”
NHTSA complaint #11490237, filed 2022-10Related service bulletins
- 11037018Sep 4, 2026This Service Alert supersedes the previously issued service alert listed below. The changes are noted in Red text. SA-038/26 06/15/26 DESCRIPTION Some customers may complain…
- 11034448Jul 1, 2026This Service Alert supersedes the previously issued SAs listed below. The changes are noted in Red text. SA-017/25 12/16/25, 09/08/25, 07/14/25, 05/15/25 and 03/21/25 DESCRIPTION…
- 11034447Jun 19, 2026This SA supersedes the previously issued SA(s) listed below. The changes are noted in Red. SA-061/25 12/17/25 DESCRIPTION If you encounter any type of electrical concern (e.g…
- 11034436Jun 18, 2026This bulletin supersedes the previously issued bulletin(s) listed below. The changes are noted in Red. 09-012/21 12/13/21, 06/10/21 and 04/27/21 DESCRIPTION Some customers may…
- 11032106Apr 29, 2026Valve Stem Seals Class Action Settlement Program for Excessive Oil Consumption and Oil Consumption Powertrain Warranty Extension Special Service Program SSPD5. Updated April 28…
- 11032103Apr 21, 2026This Service Alert supersedes the previously issued SA listed below: The changes are noted in Red. SA-011/24 02/12/24, 06/06/24, 07/29/24 DESCRIPTION Mazda has developed factory…
- 11032101Apr 16, 2026This Service Alert supersedes the previously issued M-Tip(s) listed below. The changes are noted in Red text. MT-002/19 09/30/19 and 12/19/19 DESCRIPTION If an engine assembly is…
- 11030636Mar 11, 2026This Service Alert supersedes the previously issued SA(s) and TSB(s) listed below: The changes are noted in Red. SA-035/24 05/31/24 DESCRIPTION There is a concern that some water…
- 11029240Feb 26, 2026This bulletin supersedes the previously issued bulletin(s) listed below. The changes are noted below in Red. 01-007/24 06/20/24 ENGINE OIL LEVEL WARNING LIGHT ON WITH DTC…
- 11029541Feb 6, 2026SPECIAL SERVICE PROGRAM - SSPD5 - WARRANTY EXTENSION - MULTI-MODEL - VALVE STEM SEALS CLASS ACTION In conjunction with a Class Action Settlement, Mazda Motor Corporation has…
Engine: other model years
| Year | Complaints | Share of year |
|---|---|---|
| 2021 | 21 | 53% |
| 2020 | 5 | 26% |
| 2019 | 23 | 43% |
| 2018 | 76 | 59% |
| 2017 | 43 | 70% |
| 2016 | 68 | 64% |
| 2015 | 17 | 49% |
| 2014 | 19 | 35% |
| 2013 | 17 | 25% |
| 2012 | 25 | 11% |
| 2011 | 15 | 9% |
| 2010 | 23 | 12% |
| 2009 | 4 | 7% |
| 2008 | 6 | 3% |
| 2007 | 3 | 3% |
Other parts of the 2021 Mazda CX-9
6 complaintsTransmission and drivetrain
5 complaintsBrakes
4 complaintsForward collision avoidance
4 complaintsVehicle speed control
3 complaintsAir bags
2 complaintsBack-over prevention (rear camera)
2 complaintsElectrical system
2 complaintsSteering
1 complaintsSuspension
1 complaintsTires
1 complaintsVisibility (wipers, defrost, mirrors)
1 complaints
← All problems reported for the 2021 Mazda CX-9
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 27, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology