2016 Mazda CX-9 · symptom sheet
Check engine light or misfire
- 41owner reports
- 80,000median miles
- $6,000median quote
- 0involved a crash
Newest report Apr 28, 2026 · checked Oct 2, 2026
82 of the 105 complaints on this car are about the engine. 41 of those describe misfire. Only overheating is reported more often on this car.
Tick what matches of 41 reports
Misfire on other CX-9 years
Report counts are for each model year on its own, so a newer car has had less time to collect them.
What this problem usually is
These reports start with the check engine light. Many describe the engine running rough or shaking at idle, a P0300-series code, or a catalytic converter code. A worrying number say the light was flashing. Owners often list ignition coils or spark plugs already replaced, and the light coming back afterward.
What got replaced
Few of these reports name the part that was replaced.
Recalls and investigations
No recall on the engine covers the 2016 model year as of Oct 2, 2026.
What owners paid
17 of the 41 reports quote a price. Each dot is one quote. The middle half runs $5,000 to $7,479.
When it happens
The middle half of failures fell between 55,000 and 120,000 miles, from the 14 reports that gave a mileage.
Is this a known problem?
The manufacturer has sent NHTSA 22 service bulletins or notices for the 2016 Mazda CX-9 that deal with this problem. Newest first.
Federal rules make a manufacturer send NHTSA a copy of any notice about a defect that goes to more than one dealer or owner. Most of these are service bulletins, the repair instructions manufacturers send to dealers. NHTSA generally leaves safety recall bulletins out of this file, and recalls are listed separately.
Mazda Motor Corporation has decided to conduct a Customer Service Program (CSP11) to extend the limited powertrain warranty to 10 years or 120,000 miles, whichever occurs first, for necessary repairs if the covered vehicle has coolant leaks at the cylinder ...
Some vehicles may have coolant leaks at the cylinder head around the exhaust manifold (as shown below). There may be cracks at the stud bolt hole (1) or at the outside of the exhaust manifold flange (2) on the cylinder head.
CSP11 - COOLANT LEAKS AT CYLINDER HEAD WARRANTY EXTENSION For certain 2019-2020MY CX-5, 2016-2020MY CX-9, 2018-2020MY Mazda6 that are equipped with SKYACTIV-G 2.5T engine, the warranty coverage for specific repair of the coolant leak at cylinder head is extended to: 10 years (120 months) or 120,000 miles (192,000 ...
Some customers may complain about a poor acceleration and rough idling or the CHECK ENGINE light ON with DTC P0301:00, P0302:00, P0303:00, P0304:00.NOTE: Only turbo engines are applicable; non-turbo engines are NOT applicable.
18 more on the 2016 Mazda CX-9 page.
What owners wrote
“Cylinder head crack. Combustion gasses leaking into coolant causing overheat. Combustion gasses bleeding into oil causing excessive crankcase pressure.”
Filed Oct 25, 2025
“Vehicle had a horrible coolant leak at the rear of the engine to find out the engine has a weak cylinder head and is known to break and leak coolant. The vehicle will need a new cylinder head or engine replacement.”
Filed May 24, 2024
“The intercooler failed or failed cylinder head causing coolant leaking into the exhaust side and cause the engine to over heat.”
Filed Jan 9, 2024
“I just had my engine replaced due to a cracked cylinder head that allowed coolant to leak into cylinder #3 & #2.”
Filed Sep 15, 2023
Should you keep driving it?
This page can't tell you that. 0 of 41 reports involved a crash. Owners who file are the ones who had a bad experience, and nobody checks their reports. If the problem affects steering, braking, power or a fire risk, treat it as a safety fault and have it inspected before a long or high-speed drive.
File your own report with NHTSA. Complaint counts are how a problem gets an investigation. How reports land on this sheet.
Guide Which lights mean pull over now? Warning lights by color and urgency
Other problems on this car
- Engine overheats or leaks coolant 52 reports