2020 Ford Mustang

2020 and above Mustang Ecoboost 2.3L engines are supposed to have the revised engine block design to mitigate coolant intrusion into cylinders and head gasket leak issues. My 2020 model year Mustang Ecoboost with the updated block, is suffering from coolant intrusion into cylinder #1. Confirmed by independent ASE certified repair shop as well as Ford dealership. No Codes. Symptoms includes cold start misfires and cold start white smoke from exhaust. MPG was inconsistent as well since the air/fuel ratio is disturbed by coolant intrusion. Car is at roughly 37K miles. IF ISSUE IS NOT REMEDIED, YOUR ENGINE MAY BLOW UP DURING OPERATION WITHOUT WARNING.

The contact owns a 2020 Ford Mustang. The contact stated while driving at an undisclosed speed, there were several unknown warning lights illuminated. Additionally, the contact noticed smoke inside the vehicle and there was smoke coming from under the hood. The vehicle was towed to the dealer where it was diagnosed with failed pistons and a blown engine. The contact was informed that the engine needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure and a case was filed. The contact was advised to contact the NHTSA Hotline to report the failure. The failure mileage was approximately 73,300.

On 03.29.25 (Saturday) the car started rough and the check engine light came on. I took it to the mechanic 03.31.25 (Sunday) and they inspected the car and told me that it is either the head gasket or the engine block is cracked because there is coolant intrusion into the cylinders. They asked me to call FORD customer service and ask if there was any way to cover it under warranty as the car only has 64K miles. I was told no, the warranty was 5yrs or 60K whichever came first and the 5 years was October of 2024. They suggested I file a report with the NHTSA. The vehicle right now is at the mechanic as I try to decide what I would like to do with it. If the engine failed when driving, I don't know what would have happened. There were no other symptoms to the problem prior to the failure. In fact, weeks earlier I had it inspected to see if any maintenance was needed and it got a clean bill of health.

The contact owns a 2020 Ford Mustang. The contact stated that after adding oil to the engine, the contact became aware that a significant amount of the engine oil had leaked out onto the ground. The vehicle was not diagnosed or repaired by an independent mechanic or a dealer. The manufacturer was notified of the failure and informed the contact that they could not assist because the VIN was not under recall for the failure. The failure mileage was approximately 72,000.

The contact owns a 2020 Ford Mustang. The contact stated that the engine overheated while driving at various speeds with the temperature gauge showing that the engine was hot(H). The contact stated that the vehicle hesitated while depressing the accelerator pedal with an engine misfire alert on the Ford App. The vehicle was taken to a dealer where a pressurized test was performed; the test showed no defect with the engine. The contact then took the vehicle to an independent mechanic where the spark plugs, and cabin air filter were replaced, and the fuel system was cleaned. The check engine warning light illuminated soon after the repair. The vehicle was taken back to the dealer where it remained unrepaired. The manufacturer was notified of the failure and a case was filed. The failure mileage was approximately 59,000.

A 2020 Ford Mustang eco boost premium 2.3L L4 DOHC 16 valve 6-speed manual with push button start convertible top burst into flames on [XXX] at about [XXX]. The entire car and the black box were consumed by flames that spread to my carport, shed and mobile home. From what I read; it might have been designed for a road racing car. I am [XXX] , and requested a small car from Enterprise and this is the only car they had for me. Zero to 60 mph: 4.9–5.7 sec Zero to 100 mph: 13.5–15.5 sec Standing ¼-mile: 13.4–14.3 sec Top speed: 145–155 mph. Why would they have put [XXX] in this car? I drove it as cautiously as I drive my 2011 Taurus. I did nothing to cause this fire. I have reached out to FMC and Enterprise and have finally come to terms that I have to ask for charity to get the home livable. We run a gas generator for one air conditioner, small frig and well pump for water. The roof leaks, the firefighters puled every outlet in the rooms near where the fire entered my home. The electric meter was pulled off my pole as is standard procedure in my county. Now I am begging for a new roof and a new 200 amp box and all new wiring so the county will allow the electric to be connected again. FMC did not design this car well. It caused a disaster for me and my family. I cannot afford a new home, I just want to get this one livable. Entreprises had RIMKUS do a complete investigation which revealed nothing. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

The contact owns a 2020 Ford Mustang. The contact stated that the engine warning light was illuminated. The vehicle was taken to the local dealer, where it was diagnosed and determined that the catalytic convertor and active grill shutter assembly needed to be replaced. The vehicle was not repaired. The manufacturer was contacted and referred to the NHTSA Hotline. The failure mileage was approximately 86,000.

The contact owns a 2020 Ford Mustang. The contact stated that while driving at 15 MPH, the accelerator pedal was depressed; however, the vehicle failed to accelerate as intended. The check engine warning light illuminated, and the vehicle was misfiring. Additionally, the vehicle was shaking, and the contact pulled over to the shoulder of the road. The contact turned the vehicle off and restarted the vehicle. The vehicle was driven to the residence. The contact stated that the failure was persistent. The vehicle was taken to the dealer where it was diagnosed with coolant leak into the cylinders and the engine needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure and advised the contact to report the failure to the NHTSA Hotline. The failure mileage was approximately 63,000.

The contact owns a 2020 Ford Mustang. The contact stated that while driving at 15 MPH, the check engine warning light illuminated, and the vehicle lost motive power. The vehicle was taken to a dealer where it was diagnosed that coolant had leaked into the engine, causing misfiring codes and a lack of motive power which resulted in the engine needing to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was 66,500.

I hope this letter finds you well. I am writing to bring to your attention some serious safety issues that I have encountered with a 2020 Mustang that I purchased from CarMAX, West Valley on September 24, 2023. Soon after taking possession of the vehicle, I noticed a malfunction with the airbag system. It is disheartening to report that I had to endure a three-day wait to have the necessary repairs carried out. The delay in rectifying this crucial safety feature is highly concerning, as it exposes both the driver and passengers to unnecessary risks. Unfortunately, the problems did not end there. Shortly after the airbag issue was addressed, the engine light illuminated on the dashboard. Despite my efforts to troubleshoot the problem myself, the light remained illuminated, indicating a persisting issue with the engine. Not only did this cause me considerable inconvenience, but it also raised concerns about the overall reliability and safety of the vehicle. The most alarming incident occurred on October 2, 2023, when my car unexpectedly broke down while I was driving on the freeway. This unexpected failure not only posed a significant risk to my safety but also left me traumatically shaken by the experience. I cannot emphasize enough the fear and anxiety I felt as I navigated the dangerous situation caused by the vehicle's sudden malfunction. I am deeply disappointed by the lack of quality control and the subsequent safety hazards that have plagued my 2020 Mustang. As a consumer, I have a reasonable expectation that the vehicle I purchase will be safe and reliable. It is distressing to find myself in a situation where my safety and wellbeing are compromised due to these issues. I have taken my concerns up with CARMAX and I am waiting for a response. It is my hope that they will investigate the matter and take measures to address it. I will not stop fighting for the safety of my family and myself.