The contact owns a 2019 Ford Mustang. The contact stated that the check engine warning light remained illuminated, and upon inspection, the contact became aware that there was coolant leaking from the exhaust system. The vehicle was taken to a local dealer to be diagnosed, and it was determined that there was coolant intrusion into the engine. The contact was informed that the engine needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The approximate failure mileage was 54,807.

- Deerfield Beach, FL, USA

The contact owns a 2019 Ford Mustang. The contact stated while driving at undisclosed speeds and attempting to accelerate, the vehicle failed to accelerate as intended but started decelerating instead. During the failure, the contact would pull over to the side of the road, shift to park, turn off the vehicle, and then wait a while before restarting the vehicle for the vehicle to drive as intended. The failure also occurred while attempting to accelerate while idling. The contact stated that for several months during the failure, the check engine warning light was illuminated. The vehicle was taken to the dealer to be diagnosed, and the contact was informed that there was a misfire in cylinders #2 and #3. The dealer reset the computer to remove the code. The contact stated that three days later the check engine warning light was illuminated again. The vehicle was returned to the dealer who detected a misfire in cylinder #1. The spark plugs, crankshaft sensor, and coil packs were replaced. The check engine light was no longer illuminated; however, the failure persisted. The failure became more persistent, and the contact was pulling over to turn off and restart the vehicle more often. The contact had decided not to drive the vehicle due to the consistency of the failure. The dealer was contacted and confirmed that the failure was common for similar vehicles. The dealer diagnosed that the head gasket had failed; however, it was not recommended to be replaced due to the failure recurring after the repair was completed. The dealer recommended that the engine be replaced. The vehicle had not been repaired. The manufacturer was made aware of the failure and filed a case. The manufacturer confirmed that there was no recall on the VIN for the failure. The manufacturer referred the contact to the NHTSA Hotline to report the failure. The failure mileage was approximately 42,000.

- Chalmette, LA, USA

The contact owns a 2019 Ford Mustang. The contact stated while driving or while the vehicle was parked, the vehicle was leaking coolant. The contact stated that while washing the vehicle, the contact became aware that coolant was leaking from the engine compartment. The vehicle was taken to the local dealer where it was diagnosed and determined that the coolant pipe needed to be replaced. The contact stated that the battery was replaced, the oil was changed, and an unknown software was updated. The manufacturer was notified on the failure but offered no assistance. The approximate failure mileage was 16,600.

- Rocklin, CA, USA

The contact owns a 2019 Ford Mustang. The contact stated that a ticking sound was coming from underneath the hood of the vehicle while driving at various speeds and while the vehicle was idling. The contact stated that the RPM dropped while idling and while decelerating. There were no warning lights illuminated. The vehicle was taken to the dealer where it was diagnosed with a failure in the lifters inside the cam phaser. The vehicle was not repaired. The vehicle was taken to another dealer, Lithia Springs Ford (870 Thornton Rd, Lithia Springs, GA 30122), where it was diagnosed with the same failure. The dealer informed the contact not to repair the vehicle due to the engine's design being known to have the failure. The contact was informed that the failure was related to TSB: SSM52334, NHTSA ID Number: 10251951 (Engine and Engine Cooling). The vehicle had not been repaired. The vehicle had been taken to a certified mechanic who confirmed the diagnosis. The vehicle had not been repaired. The manufacturer was made aware of the failure. The manufacturer referred the contact to the NHTSA Hotline to file a safety complaint. The failure mileage was 94,000.

- Atlanta, GA, USA

The contact owns a 2019 Ford Mustang. The contact stated while starting the vehicle, there was white smoke coming out of the exhaust pipe. There was no warning light illuminated. The vehicle was towed to the dealer, where it was diagnosed. The dealer determined that the head gasket replacement and a post repair inspection needed to be performed. The vehicle was not repaired. The manufacturer was notified of the failure and referred the contact to the NHTSA Hotline for assistance. The failure mileage was approximately 130,000.

- Cypress, TX, USA

The contact owns a 2019 Ford Mustang. The contact stated that during a routine oil change, the technician observed that the coolant level was low. The coolant reservoir was filled however, the contact reported that when another oil change was made, the coolant level was again very low and was refilled. The contact stated no warning light was illuminated. However, the contact stated that he noticed a small cloud of white smoke emitted from the exhaust pipe when he started the vehicle one morning. The contact had taken the vehicle to a local dealer, where it was diagnosed and determined that coolant had intruded into cylinders #2 and #3 and that the head gasket was damaged and needed to be replaced. The vehicle was not repaired. The contact was advised by the dealer that this was a known failure with the 2.3-liter EcoBoost engine. The manufacturer was informed of the failure. The failure mileage was approximately 66,250.

- Pembroke Pines, FL, USA

The contact owns a 2019 Ford Mustang. The contact stated while driving 40 MPH, the vehicle briefly sputtered before returning to normal functionality. The check engine warning light was illuminated. The vehicle was taken to the dealer, who determined that the coolant intrusion had damaged the engine. The contact was informed that the engine needed to be replaced. The vehicle was not repaired. After investigating the failure, the contact related the failure to Customer Satisfaction Program: 21N12. The manufacturer was notified of the failure but referred the contact to the NHTSA Hotline for assistance. The failure mileage was 88,000.

- Hampton, VA, USA

The contact owns a 2019 Ford Mustang. The contact stated that while driving at an undisclosed speed, the check engine warning light illuminated on the instrument panel. The vehicle was taken to an independent mechanic, who determined that there was a misfire in cylinders #1 and #3, requiring the replacement of the spark plugs and ignition coil. The vehicle was repaired, but the failure reoccurred. The vehicle was then taken to the dealer, who determined that coolant intrusion had damaged the engine, requiring the engine to be replaced. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was 71,000.

- Torrance, CA, 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