The contact owns a 2018 Mazda CX-5. The contact stated that the vehicle was taken to the dealer for a scheduled service appointment. During the inspection, the contact was informed that the vehicle had a cracked cylinder and the cylinder head needed to be replaced. The vehicle was not repaired. The contact was informed that the repair would not be covered under the warranty due to the warranty being expired. The manufacturer was made aware of the failure. The failure mileage was approximately 84,000.

- Kansas City, MO, USA

Defective cylinder head resulting in oil leak. Confirmed and inspected by dealer. No warning messages or symptoms. Just smell of burning oil.

- White Hall, MD, USA

I just had my vehicle in for routine maintenance and oil change and three days later it started leaking oil, staining my driveway, with the leak getting progressively worse then my check oil light went on, and the day I brought it in, and it was smoking under the hood. My safety and the safety of others on the road was at risk. At the routine maintenance visit they found no issues with the vehicle. After bringing it into the dealership they diagnosed it as a cylinder head crack needing replacement. We had another dealership look at the diagnostic video and explain that this is poor manufacturing. It-??s just over 60,000 miles but is still within our warranty from a timeline aspect. Upon research we found this is happening to many people with a Mazda-??s from year, 18 to 21. There are many forums about this. Upon an online search we found this problem documented as tsb SA-031/21. I am disappointed that the Mazda company is aware of the faulty cylinder heads in this vehicle, and now I am responsible for the maintenance charge.

- Eden Prairie, MN, USA

I own a Mazda that I purchased new in 2018. I have kept up with the maintenance to a -??T-??. I have never abused it. About a month ago I started smelling a strange smell. Like smoke or burnt oil. A couple of weeks later, the engine oil level light came on and the engine was low on oil and that-??s when I started seeing that the motor was leaking oil, and I just found out that the engine head cylinder has a crack. I found out that these vehicles have a defect from the factory on this part that cracked, -??Engine Head cylinder-??. And now to repair it, it is going to cost me around $6,000. The warranty has run out.

- Sealy, TX, USA

Had an slow oil leak. The cylinder head was cracked in my engine

- N Chesterfield, VA, USA

Many incidents have occurred with this vehicle. First occurrence happened 11/25/21. Attempting to pass another vehicle and the car began slowing down and various warnings came on. Pulled off to the side of the road, turned off the vehicle and restarted without any further incident. This same thing happened 2 times in 12/2021 both time attempting to pass another vehicle. 2nd time in December the check engine light came on. Scheduled to be seen by a mechanic with the earliest appointment on 12/31/21. Mechanic recommended taking to a licensed Mazda mechanic. Appointment was on 01/07/22. They looked at the car and fixed the issue. Can't remember the issue at that time. By 05/2022, check engine light came back on and car would start slowing down and shutting off when attempting to pass another vehicle. If RPMs would go to high, car would do this. Check engine light came back on. Took to Mazda mechanic on 06/17/22. After several troubleshooting fixes, it was determined I needed a new engine as there were parts broken missing or broken. Did not have my car for 13 weeks. Most recently, on 08/13/23, car shut off in a drive through. Towed to mechanic and needed a new camshaft. Picked up my car on 08/21/23 and within 45 minutes, car shut off while driving up a hill. Towed back to mechanic. This time there are electical issues and an ill fiitting pin. Have to take it to a licensed Mazda mechanic. Having to tow it due to how unsafe it is to drive. Reached out to Mazda with my concerns over saftey and waiting to hear back. Very concerned that this will never be resolved and that this is a very unsafe vehicle to drive.

- Johnstown, PA, USA

On 7/30/23, I was driving home from church, and was driving on the freeway in the fast lane when my 2018 Mazda Cx-5, that was only 5 years old, with only over 33.2K miles on it, started to stall. Thankfully, it didn't come to a complete stop, but slowed down tremendously, and had at least 5 malfunctioning lights come on all at once. The car wouldn't go over 25 miles afterwards. I was very thankful to make it home safely, but this was very alarming, since I never had any issues with that car, and always kept it very well maintained. For a car that was only 5 years old and had only 33.2K miles on it, to experience such a drastic problem, is very confusing. It was very concerning that the car almost came to a complete stop unexpectedly without any warning ahead of time, especially while driving in the fast lane on a freeway. I also took pictures of the malfunctioning lights that came on right after the incident took place. I had the car towed into the dealer the next day, and they told me that it was unusual that my engine would do that. They said that it needed a tune up earlier than expected. I was told that the 3rd cylinder was misfiring, and also when the engine isn't working properly, everything else in the car would shut down. Now, why would a car that's been very well maintained, with only 33.2k miles on it need a tune-up? And I always kept up with the oil changes on time. I found out that there was an engine recall on these particular models, but I was told by Mazda that my VIN # did not qualify; however, what I experienced, did fit the description of the recall. I've since then, decided to trade in the car, because I was just too afraid to continue driving it after this experience. I am however, very upset that I had to give up a car that I invested a lot of money in and took very good care of, and only had 33.2k Miles on it.

- Roseville , MI, USA

When I turn my car off I get ignition switch and it stalls then my engine come on and off

- Tabor City, NC, USA

The contact owns a 2018 Mazda CX-5. The contact stated that while stopped at a traffic light, the contact became aware of smoke coming from underneath the hood. The vehicle was taken to an independent mechanic and the contact was informed that the cylinder head was defective and needed to be replaced. The manufacturer was made aware of the failure. The failure mileage was approximately 62,400. The contact stated the cylinder head is porous and oil leaks out of it. Also, 6 hydraulic lash adjusters were failing and needed to be replaced.

- Tulsa, OK, USA

Engine oil started leaking after I noticed smoke coming from the hood of the car. No warning signs, no check engine light, nothing to indicate any issues until this occurred. Took the car to the dealership who confirmed it was a cracked cylinder head which is now being replaced.

- Austin, TX, USA

Driving down the freeway smoke started coming out of the hood of the car and into the cabin, no warnings or warning lights of any kind, got the car to the Mazda dealer to be inspected. The dealer told me it was 5 months out of warranty and would not be covered its a cracked cylinder head and oil had dripped/leaked onto the manifold causing the smoke. No smoke was coming from the exhaust so the crack only leaked oil to the outside of the cylinder head. There is no oil in my driveway so it happened that day on the road. This is a manufacturing error that Mazda won't take responsibility for.

- Vancouver, WA, USA

When driving I started to smell a burning oil or rubber smell inside the cabin of the car. When I stopped I could see smoke coming from under the hood. When I was able to park, I opened the hood and could see smoke coming from the engine. There were no warning lights displaying on the dash, no leaking fluid from under the car. I did not feel safe continuing to drive the car without having it seen, so I took it to the closest Mazda dealer service. After inspecting the issue I was told there is a cracked cylinder head that is leaking fluid into the engine and the exhaust and I would need a brand new engine. The service manager said this is a known issue with the 2018-2021 Mazda CX-5. Unfortunately, the warranty that would cover this expired in April 2023 (at the time of writing this, it's May 1, 2023). It should be noted that my CX-5 is only 5 years old with ~37,000 miles on it. I was told by the Mazda service manager that the car is not safe to be driven in this condition and would have to stay in their possession on their lot until I decide if I want to have it fixed.

- Ijamsville, MD, USA

Crack in cylinder head at 25k caused oil to leak and engine to smoke while driving. No warning lights came on. Dealership replaced the part but how do I know it won't happen again? Mazda knows about this but has not issued a recall or extended the powertrain warranty to cover this known manufacturing defect.

- Bedminster, NJ, USA

Oil drained to warning level from full during a vacation. The oil leaked out around head gasket level onto every part of the engine below it and the movement of air caused oil droplets to fall on the exhaust and smoke and also coated entire underneath and most of rear hatch with oil droplets.

- Pembroke Pines, FL, USA

2018 Mazda CX-5. While driving a burning smell was detected (oil). Oil leakage noticed when car parked. The vehicle was taken to the dealer where it was diagnosed with a cracked cylinder head. There is a service bulletin stating defect in engine head. Mazda will not cover costs, as its outside 60,000 mile warranty. Quote given of $4085 to fix issue. The vehicle was not repaired. The manufacturer was made aware of the failure and informed the contact that there was no recall associated with the VIN. The failure mileage was approximately 85000.

- Valatie, NY, USA

After driving when I got off my car, I could smell something burned. I took my car a dealer shop, and they found the Crack in a cylinder head. The cylinder head has been fixed, but I can still smell something is burning.. I am not sure it is totally fixed or not.

- San Mateo, CA, USA

2023 02 28, 36410 miles - Engine oil burning smell entering the cabin of the car, oil leaking from engine. No warning lights. Diagnosed by Mazda dealer as a cracked cylinder head, will be repaired under warranty. Discovered Service Alert #SA-013/22 that applies to this defect. 2023 02 23, 36,389 miles - Car in for an oil change under extended service program at Mazda dealer. Dealer discovered the timing chain cover leaking, repaired under warranty. Owner also reported that information screen has been malfunctioning intermittantly. Dealer remarked that the screen does have problems, but that it is not covered by the warranty, and would need to be replaced within the next two years and would cost about $2000. Upon vehicle pick-up, several warning lights went on, dealer reprogrammed the code system, test drove, pronounced the lights indicated nothing was wrong. 2022 08 17, 31,174 miles - Fuel pump replaced under recall while car in for regular oil change covered by service contract. 2021 02 04, 17,629 miles - Timing chain cover leaking, discovered by dealer while in for regular oil change, repaired under warranty.

- San Rafael, CA, USA

Mechanic stated engine cylinder head oil hole leak. Seems to be manufacturer defects

- Parkville, MO, USA

Cracked cylinder head, significant oil leaking, no engine lights. No past collisions in vehicles or indicator engine was running hot. Dealership reported they see no history of fault codes on vehicle computer.

- Chesapeake, VA, USA

On 12/23 I was driving on the highway approaching exit 43 A-B on I-95 N and the engine oil light came on, I started monitoring the temperature of the car and it was holding steady, neither was it dropping nor was it overheating. I continued driving for a minute more, I am half mile away from home at this point and I smelled burning oil. I pulled the car over and opened up the hood, I turned on the flashlight on my phone and I could see oil on the engine floor. I called up Mazda dealership near me and they were closed for the holidays so I left voicemails. After a couple of days of no answers, I was able to get through to someone and they said they'll take the car in however they can't guarantee if they will be able to even look at it until after the holiday, I speak to the service manager and mention that I have an upcoming trip out of state for Christmas, they said they did not have any loaner cars available either. I got my car towed to the dealership anyways. Next day I get a phonecall from them stating that the oil pump and pressure was fine and they suspect it was the engine head that was causing the leak and that it would cost me 6000$ to fix it. Along with that I need to get my belt tensioner fixed which would be around 680$. The car's estimated value is about 12000$ and I am being asked to pay more than half its value after owning it for 4 years to fix something that was caused by wear and tear. I also did a little digging and I've found that my car falls under ones that have been identified by Mazda to probably have a defective engine head. I am attaching the reports that I have discovered in my research with this submission. I am imploring for assistance in this matter as I cannot afford this expense and I would not like to part ways with something that has been reliable for the last 4+ years. Dealership- Wellesley Mazda

- Waltham, MA, USA