9.4

really awful
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
1,374 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2018 Mazda CX-9 engine problems

engine problem

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2018 Mazda CX-9 Owner Comments (Page 4 of 4)

« Read the previous 20 complaints

problem #5

May 292022

CX-9

  • miles

A D V E R T I S E M E N T S

Car starting misfiring. I was told it appears to have a crack in the head gasket & would be best to repair the engine. This car has only 80k miles and should NOT be doing this at this stage!!!

- Orlando, FL, USA

problem #4

Jan 132022

CX-9

  • miles
had loss of coolant mid to late January 2022, which lead to over heating notifications. Upon inspection at dealer (Pacifico Mazda Philadelphia PA), it was determined that i had a cracked cylinder head. Initially dealer said they were to replace just the cylinder head & after about 1 week they said that the engine would be replaced. Received car back 4/06/22

- Philadelphia, PA, USA

problem #3

May 282021

CX-9

  • miles
When I shifted into reverse the back up camera wouldn-??t come on and instead a screen that said check your surroundings stayed on the screen. I reset it using the 3 button reset method and it came back on. Drove it to the grocery store, and then it sat in my driveway for 3 hours. When I went to go back in to town, the car was completely dead. No power whatsoever. We tried jumper cables and those didn-??t work. Finally tried a battery charger and after an hour of charging it finally came back on. A car this new shouldn-??t be having these issues.

- Neotsu, OR, USA

problem #2

Apr 242021

CX-9

  • 10,300 miles
Happened to me two times in past three weeks, where I am coming to a stop, or hardly moving, and car suddenly accelerates. Had my foot on the brake and the car was still trying to accelerate. Yesterday, 4/24/21 it took all my strength on the brake to keep the car from pulling into oncoming traffic. I have been driving for 39 years and have owned many cars, and something like this never happened to me. I will be bring the car dealership tomorrow, the car has only 10K miles on it as we don't do a lot of driving with it as we owe two cars. I did not have my foot on the wrong pedal, this is very dangerous and if the dealer does not find anything with the car, I intend to sell it, as this is probably one of the scariest experience I had with a car. It is intermittent, so I am not sure when its going to occur, but twice in the last few weeks is not coincidence ( it also happened to my wife a few months ago, but we thought it could have been due to snowy road conditions). In one case I was coming up to a stop sign, and was braking and car was accelerating as I tried to break. I had to put car in neutral and the shut off car to get to stop. Yesterday, I was pulling out of a parking lot, and was waiting for an on coming car to pass me before I could turn onto road, when car was trying to accelerate, when I had my foot on brake, and took everything to keep the car from accelerating forward into on coming car. Once car passed, I made turn onto road, and issue did not repeat on the remaining mile to my house. I went onto a Mazda forum and I saw a few others who raised the same concern/issue.

- Westhampton Beach, NY, USA

problem #1

Jul 162019

CX-9

  • 11,000 miles
I was waiting in a stationary position, at a red light, behind some other vehicles, with my foot on the brake pedal. All of a sudden, the vehicle started to lurch forward as if someone had stepped hard on the gas pedal! I was struggling to keep the car still by depressing the brake pedal harder, but it wouldn't stop the car. I had to put it in park and turn off the engine to stop the forward thrust of the vehicle.

- Brooklyn, NY, USA

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