2019 Mazda CX-9 engine problems
23 owner complaints filed with NHTSA name the engine on the 2019 Mazda CX-9 — 43% of all complaints for this model year.
What owners report
“The engine cylinder head developed an internal coolant leak, allowing coolant to enter the combustion chamber. This caused engine overheating and smoke coming from the tailpipe while driving. A dealer performed a coolant pressure test confirming coolant leaking into the combustion chamber, and…”
filed Jul 10, 2026
“My 2019 Mazda CX-9 (VIN [XXX]) suffered catastrophic cylinder head failure on the SKYACTIV-G 2.5T engine at approximately 124,000 miles. The failure is consistent with Mazda TSB 01-013/21 (and successors 01-007/22, 01-010/24), in which Mazda acknowledged that cylinder heads on this engine can crack…”
filed Jun 18, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Related service bulletins
This 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, dead battery, engine no start, DTC(s)…
SA-041-26 · Service Bulletin/Repair Instructions · issued Jun 19, 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 recommended scheduled maintenance…
SA-029-26 · Service Bulletin/Repair Instructions · issued Apr 21, 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 replaced after a catastrophic internal…
SA-026-26 · Service Bulletin/Repair Instructions · issued Apr 16, 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 pumps are being replaced that are not…
SA-014-26 · Service Bulletin/Repair Instructions · issued Mar 11, 2026
Engine problems in other CX-9 years
| Year | Reports | Share |
|---|---|---|
| 2021 CX-9 | 20 | 51% |
| 2018 CX-9 | 76 | 59% |
| 2017 CX-9 | 43 | 70% |
| 2016 CX-9 | 65 | 63% |
| 2015 CX-9 | 17 | 49% |
| 2014 CX-9 | 19 | 35% |
| 2013 CX-9 | 17 | 25% |
| 2012 CX-9 | 25 | 11% |
| 2011 CX-9 | 15 | 9% |
| 2010 CX-9 | 23 | 12% |
| 2009 CX-9 | 4 | 7% |
| 2008 CX-9 | 6 | 3% |
Other reported problem areas on the 2019 Mazda CX-9
Counts are unique NHTSA complaints naming this component group. Complaints are unverified owner reports; mileage is computed only from complaints that included a usable odometer reading.