Since purchasing the vehicle (used) there had been several issues with the engine.

- Stuart, FL, USA

I purchased this 2019 Ford Mustang Ecoboost 2.3L brand new in July 2019. It has been well maintained, regularly serviced by the authorized Ford Dealer where I purchase the car. It has never been in an accident, and has only 36,100 miles. This vehicle passed inspection last month. The check engine light came on, and then had rough cold starts. I have been informed by the service station that antifreeze is leaking into the engine, and a new engine is required (estimated cost of $11,000). After researching this matter, it appears that there is a design flaw with this vehicle, given the high number of similar occurrences with 2015-2019 Ford ecoboost vehicles. It is my understanding there is even a class action lawsuit related to this issue. Luckily, there was no accident resultant from this engine malfunction in my case, but the NHTSA should investigate this issue, given the high risk it poses to highway safety!

- Bayside, NY, USA

My vehicle experienced a blown head gasket due to a faulty engine block design at 56K miles. The car started running rough for 10 seconds upon a cold start up and was also misfiring. This is due to coolant intrusion through the gasket and it got into cylinder 3 which could have caused catastrophic engine failure or worse.There are several class-action lawsuits against Ford for the defect.Ford has not taken any steps to address this issue with the ecoboost engines on 2015-2019 models. Additionally, Ford did NOT provide relief to me and I had to pay out of pocket to fix this.

- Arcadia, CA, USA

My vehicle recently had a head gasket leak due to a faulty engine block design. I noticed one day the coolant was lower than it should be but nothing concerning, over a month or so it got progressively lower & the car would also sputter/misfire on startups from time to time. This is due to coolant slipping through the gasket & getting into the cylinder & oil which can lead to catastrophic engine failure or worse. Eventually I got a check engine light & was told it was a misfire after running a diagnostic on the vehicles OBD2. I researched what the issue could be &it became more & more apparent that it was a head gasket issue. The oil was contaminated & coolant was getting very low. Apparently it-??s a big issue since Ford is now facing a class action over the defect. The vehicle also has some issues with the transmission, for example ill start the car up on a cold California morning 50?F & let it warm up before driving & when I go into reverse after the car will jolt hard as if you were backing up & hitting something like a wall, even in the afternoon when you start it from a cold start & go into reverse it will do it. Not sure why but it-??s concerning to say the least. The transmission also feels confused when shifting, when I-??m in 4th about to push fit it will get confused & revs will drop slightly before going up again to up shift, also when downshifting due to braking the shifts can feel a bit hard, especially when needing to stopping fast. The engine & transmission are the most importantly parts of a vehicle & without them working properly is something no one should have to face.

- Watsonville , CA, USA

5.0 GT Engine continues to lose power and has loud -??clicking-?? when idling. First appeared after May 2025 oil change. Mustang dealer ran codes check - nothing shows up. Mustang dealer has recorded a video / audio of sound and recommends engine replacement. The engine only has 22,000 miles on it.

- Bradyville , TN, USA

Blown head gasket causing coolant to leak into the engine at 49,000 miles

- San Antonio, TX, USA

There is a coolant leak and that has caused significant damage to the engine due to a bad head gasket by poor manufacturing of the engine.

- Silver Spring , MD, USA

The contact owns a 2019 Ford Mustang. The contact stated that while shifting from reverse(R) to drive(D) or from park(P) to drive(D), the vehicle jerked before shifting into the intended drive mode. While driving at approximately 50 MPH, the vehicle was shaking abnormally while accelerating. The check engine warning light had illuminated intermittently. The wrench symbol was displayed on the instrument panel, and the vehicle lost power. They waited for a while before restarting the vehicle. The failure was intermittent. The vehicle was taken to the dealer, who diagnosed that there was a failure with the transmission, but had not determined which part in the transmission had failed. The vehicle was not repaired. The manufacturer was informed of the failure and opened a case. The manufacturer referred the contact to the NHTSA Hotline to report the failure. The failure mileage was unknown.

- Murrieta, CA, USA

Took car into dealership because it was running rough at start up and check engine light came on. They told us today that coolant leaked into cylinder requiring head gasket repair and pissible engine replacement. The car has less than 40,000 miles, has been gently driven, with full service records from the dealership and the extended warranty just ended in July 2024. Reading online forums, this is a very common issue due to design flaw of the Ford Ecoboost engine. What recourse do we have?

- Cincinnati, OH, USA

My 2019 Ford Mustang Shelby GT350 was driving fine until all of a sudden I got a check engine light on the dash. The vehicle was not as responsive as usual and was shaking a little bit at idle. I shut the car off and then had it towed to the Ford dealership for further analysis. After inspection at a dealership it was identified, that my engine had failed. Cylinder 8 would not hold compression and had cracked the engine block. This failure can cause complete engine failure and can be a risk to the driver, passengers and anyone else in traffic.

- Helena, AL, USA

Began over last month with difficulty or rough engine start in mornings Then engine overheated once and continues to lose coolant without visible sign of any leakage. Scan error codes P0300, P 0303, P 0304. Now with excessive steam/smoke out tail pipe when it-??s started. Took to mechanic where they verified engine coolant is in atleast, cylinder #3. My safety and that of others is the engine can fail or completely break or explode while driving, causing failure to be able to control vehicle, possibly resulting in a crash or even death.

- San Antonio, TX, USA

Blown head gasket. 26k miles. Only 6 months outside of warranty. Car is lightly driven on local roads. Routine maintenance by dealer up until end of warranty.

- Orlando, FL, USA

While driving at approximately 40 MPH, my vehicle briefly sputtered, and the check engine light was on. The vehicle seemed to return to normal functionality afterward, but upon inspection at a FORD dealership, I was informed that coolant intrusion had caused damage to the engine. As a result, I was advised that the engine needs to be replaced. There are many others that have complained about this problem and to solution. My car has 81.5k miles on it.

- Houston, TX, USA

Noticed vehicle was running rough on idle intermittently when sitting at a stop. I thought this was due to it being a very cold winter where I am located, but after a couple months, check engine light came on and was immediately brought in for service. Coolant was found leaking into a cylinder and I had to have head gasket as well as upper portion of engine replaced. From the research I have done there have been a lot of people with the same issue as mine and a design flaw in spacing between cylinders. Incident occurred less than 10,000 miles out of warranty and was not covered.

- Burnsville, MN, USA

I had a solid check engine light 2 days ago and called my local Ford dealership and made an appointment for the next morning. I had not experienced any problems that I really noticed with the performance of the car, maybe some rough shifting. I waited at the dealership while the assessment was done and they said they would have to keep it overnight to do a head gasket test. They called this morning and said that I could come get the car if i needed it but I would need to keep a check on the coolant. I decided to leave the car at the dealership. After the call, I researched the web for similar issues that this particular mustang might have and I started to worry after the info I found and the similar comments on the 2019 mustang owners on this website.

- Sylacauga, AL, USA

Second oil pressure switch in less than three months. It is a pain to get to the oil pressure switch where it is located. The switch fails and shows that there is 130+ oil pressure. Freaks the computer out. Second switch in less than three months. Factory Ford switch GN1Z-90290-D 1X is the part number.

- Las Vegas, NV, USA

My 2019 Mustang EcoBoost 2.3L i4 has experienced the coolant leak described in the on going lawsuit. I have serviced the vehicle on time Everytime and I still had to pay $10K to have the motor replaced. Why has the Mustangs not been mentioned in the lawsuit nor recalled for this?

- Sulphur, OK, USA

Bought the car for my son August 2. The engine light came on the end of October, the Ford dealer was backed up once they took a look at it in the beginning of November. They told me I needed a whole new engine due to a coolant intrusion problem. Where I bought the car from state it came with a 12 month/12,000 mile warranty but warranty company is not covering that issue. This should be a recall and the engine should be completely covered.

- Houston, TX, USA

I drive a manual 6 speed mustang gt 2019 the hazard that this vehicle is presenting and have seen many others complain about with a similar isssue that can be lethal causing an accident injury or even death. The mustang is known to have a reverse lockout feature with a collar and a plastic assembly where the shifter is, but it seems as it was poorly designed or poorly assembled as the problem many mustang owners are having ;such as me is that the vehicle will go in to reverse gear without lifting up the collar or in other words without disengaging the reverse lockout so instead of going into first gear it will go into reverse same goes for the second gear. I put the clutch in and put it in first or second gear or even just slightly pushing the shifter towards me and the reverse camera will turn on that is very unsafe and dangerous I recall this being also a dangerous thing for the Shelby gt350 recall number 19B34 it-??s not only a issues on those vehicles but also on the mustang 2019 Gt and other years

- Greenacres, FL, USA

Check engine light kept coming on for a misfire after my car was shaking in idle for months. By the time check engine light came on, the code read misfire cylinder 2. Assumed at first it was spark plugs or ignition coil, so I replaced those and still was having the issue. Check engine light was still coming on and misfire was still happening. Took car to auto shop and was told I need a new engine due to coolant leaking from engine into cylinders. Took car then to Ford dealership for them to review the problem and they came up with same conclusion and even said that this is a common problem with the Ecoboost engines. This is a KNOWN problem by Ford, and they have since corrected the issue with a new and improved engine, however they expect customers to pay for their defective engine replacement. My car is at 62,000 miles. It should not need a new engine. They sold me the car new, when Ford was well aware of this common issue which can become extremely dangerous.

- Nixa, MO, USA