2018 Mazda CX-9: check engine light

Filed Oct 20, 2024 · Engine · AZ

I purchased a 2018 Mazda cx9 from a local used car dealer several weeks ago. Check engine light came on after a few weeks for cylinder 3 misfire and there was a steep decline of the vehicle performance (hard start, rough idle, lower mpg, sluggish driving). Took it to Berge Mazda who charged me for diagnostics/spark plugs, and ignition coil. They informed me the next steps were a compression tests, fuel injectors and if that didn’t fix the problem then they wanted to strip down the engine to evaluate the cylinder head. At this point I decided to take it to my local mechanic who I trust, he diagnosed a cracked cylinder head. Now I’m stuck with a car I just bought that’s unsafe to drive needing a 6-8k repair. Upon further research there is a widespread problem with Mazda’s manufacturing of there cylinder heads on certain models (including the 2018 Mazda cx9). This is confirmed by TSB’s from Mazda along with a class action lawsuit recently filed. Upon more research on my vehicles history, I gathered that my vehicle was traded into Horne Mazda and then a couple days later auctioned to the used car dealer I bought it from. The fact that Mazda is selling off their own defective vehicles that are unsafe at auctions is absolutely disgusting and something needs to be done about it.

Filed Oct 9, 2024 · Engine, Fuel system · TX

- My 2018 Mazda CX 9 started stalling and jittering at idle and then eventually during slow driving. - Next day I got a check engine light, took to Mazda service center at the dealership I have been going to for last 6 years since I bought the car. - Service center diagnosed that there was a coolant leak through the cylinder head which seems to have cracked. - Further investigation indicated that this has been identified on many other similar Mazda engines and a Technical Service Bulletin had been issued by Mazda to Dealers. - On probing initially, dealership declined they were aware of any such problem. - The amount of repair for the engine replacement (cylinder head and other parts) is exuberant and is almost half of the value of my car, and is not expected for a low 44,000 miles car. - This had posed safety issue for my family since the stressed engine with leak in cylinder head could lead to fire and fatality. - I am awaiting response from Dealership and Mazda corporation case#[XXX] for a response especially when this issue has been filed under a class action lawsuit: [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Oct 10, 2023 · Engine, Transmission · TX

Went in to the mechanic to get a regular oil change and noticed a liquid slushing sound after starting the car up. Was informed that there is a major coolant leak somewhere in the car. Took it to Mazda dealership right away who confirmed that it is a cracked cylinder head. I got lucky that the car did not overheat on the road and happened to catch it in the nick of time. No check engine lights or low coolant lights came on at all.

Filed Mar 30, 2023 · Engine, Transmission · CA

I own a 2018 Mazda CX – 9 with only 53,300 miles. I noticed something was wrong with my engine and had no idea what the issue was. My car would not shut off immediately when I turned it off and the fan was on super high speed. The day before my appointment with my mechanic, the engine light turned on. I was stuck in a parking lot and a friend suggested I use his car to go buy coolant just in case it was needed. Sure enough, I was completely out of coolant. When my mechanic inspected the car he told me I had a coolant leak and suggested I take it to the dealer as they would know immediately what the problem was. I started researching to see if this was a defect and sure enough, Mazda has been aware of the defect with the cylinder head (TSB) not supporting the turbo of the engine causing it to crack and mix with the engine oil in various models for years, yet continue to sell cars with this known defect. I understand that it may not be life threatening yet! But it could have been should my engine had blown while I was on the freeway causing a horrific accident. How are they allowed to continue manufacturing and sell cars with a known issue for years and not even be reuqired to make a recall to have the part replaced with a stronger one? This is issue is happening to 100's of customers worldwide. This is something that should be investigated.

Filed Mar 3, 2022 · Fuel system · 65,000 miles · MD

The contact owns a 2018 Mazda CX-9. The contact stated that while pulling up to a gas pump the vehicle lost motive power and stalled. The contact added gasoline to the vehicle, restarted the vehicle, and was able to continue to drive to her residence. Several weeks later the failure recurred while the contact was pulling into a parking lot. The check engine warning light illuminated. The contact’s husband arrived at the scene and added gasoline to the vehicle. The vehicle was restarted however, the check engine warning light remained illuminated. The vehicle was taken to the local dealer to be diagnosed. The contact was informed that the fuel pump and sensor were faulty and needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 65,000.

Filed Jul 15, 2018 · Fuel system · 15,816 miles · NY

On friday (june 29th, 2018) around 9:29 pm, my car broke down while my family and I were traveling from rochester ny to boston massachusetts. I was driving down the massachusetts turnpike when all of a sudden my check engine light turned on and my car just started to slow down in the middle of the highway. I was able to pull over in time and called mazda roadside assistance because after the car stopped, it wouldn't turn back on. Since we were on a restricted highway, my car had to be towed and we were taken to a safer location. When the car was put down, it turned on and the check engine light was still on and the fuel gauge said that the car still had 40 miles left. The guy that towed our car said that it might have been a fuel issue, so we went to get gas. Once we filled up our tank the check engine light was still on but we were able to reach our destination. The next morning, I took the car to the nearest mazda dealership and they restarted the car and according to their report nothing was wrong with the car. They said that it was safe to drive but they had no clear reason as to why the fuel gauge wasn't stating the correct information. After the trip I, reported this issue to mazda and they didn't answer me until two weeks later. Their response was that there was probably nothing wrong with the vehicle and that this was a one time issue. I did research on my own and discoveries that someone from saudi arabia had a similar issue. Since mazda hasn't been willing to help resolve the situation I am filing this complaint because I am not willing to put my families life in the same risk again.