The exhaust manifold warps under excessive heat due to the proximity of the turbochargers to the manifold in the 3.5L EcoBoost engine, causing the manifold to separate from the engine and will frequently break studs (most notably the rear stud) causing exhaust leaks, power loss, emissions problems, and can lead to mixture problems which will cause further damage to the engine if not addressed immediately. This could also lead to engine failure and crashes or fires.

- Hockley, TX, USA

1-the Brake System Light has come on and brakes are extremely hard to press and use. I was having issues with the brake pedal slowly going to the floor while sitting at a stop. Today they will not go down at all and brakes are very difficult to press. very dangerous to drive and a safety issue. I see that my VIN does not show a recall for it, but there is recall #20S31 that relates. 2-The engine has an exhaust leak while driving and it smells as though the exhaust is getting into the cab of the truck. I was told the manifold is bent because of a design flaw in the manifold missing a bolt. been making this noise since the truck was rear-ended by semi truck.

- Thornton, CO, USA

Exhaust manifold bolts are failing, causing leaks that could cause potential fire. Also exhaust leaks before the catalytic converter, emission control.

- Batavia, IL, USA

Failing Exhaust manifold and studs

- Overton, NV, USA

Repeatedly faulty exhaust manifold stud bolts. They continue to break.

- Overton, NV, USA

Engine shutting off at stop this is not the auto shut off model, this has happened 3 times and many other owners have already contacted Ford about recall

- Belton, SC, USA

Exhaust Manifolds warping. This issue is not only very disappointing that Ford hasn't addressed this issue but is a safety concern as well. This allows exhaust fumes to escape not only into the air but potentially inside the cab. This could result in serious lung issues and needs to be addressed. Thank you!

- Bellevue, NE, USA

Manifold bolts broken causing an exhaust leak inside vehicle.

- Troy, IL, USA

My Ford dealer replaced the defective throttle body on my 2015 F150 Ford truck. I was charged for the repair and Ford advised me that the extended warranty on this component did not apply to my vehicle. My trucks engine completely shut down while I was driving. I was very luck I was on a back road and was able to coast until it was safe to pull off the road. After restarting my truck, in a few miles, it did the same thing. Again, I was very lucky to still be on a back road and able to coast to a safe spot to pull off the road. I restarted the truck and made it to my Ford dealer a few miles away without further incident. Both times my truck engine quit, there was a warning light on the dash board that lite during the event. I believe it said -??maintenance required-?? but not sure. I was preoccupied looking for a safe place to pull off the road. No warning came before the event. This engine shutdown could have put myself and others in danger had it occurred on the freeway.

- Fayetteville , GA, USA

Truck sporatically fails to start or motor shuts down within five minutes of driving. Starter remains ingaged even in run position, needs to be cycled to off position to dissengage. After cooling at least 10 minutes truck usually starts and runs normally for a few days until it does it again. Dealer cannot find anything wrong and refuses to look any further. Shuting down at speed on the road safety hazard. Almost impossible to stear or break after engine shutdown. No engine codes or warning lamps.

- Inglis, FL, USA

My vehicle has a factory feature called "Hill Decent Control". this past week I have been getting a Default Message "Hill Decent default" and the accelerator pedal stops working. This has happened in the middle of the road (in traffic) for no apparent reason, where I have to stop the vehicle, turn off the engine, then restart. I have read on line where other Ford F-150s have experienced this same issue. I contacted ford, and they said they have no Recalls or TSB's regarding this unsafe issue. I now need to find a reputable shop to diagnosis the exact cause and repair needed.

- Long Beach, CA, USA

The exhaust manifold rear stud broke causing leaking emissions to potentially be released into the cab of the vehicle putting the driver and any passengers at risk. This is a known problem with Ford's 3.5L twin turbo eco-boost engines and they are failing to recognize this problem. It has been confirmed that this is the issue and no other entity has been involved in this issue. There is no, nor has been any warning lamps or messages with this issue. It is available to be inspected if needed.

- Cedar Rapids, IA, USA

Manifold bolts have failed my 3.5L Ecoboost. Fumes are consistently entering the cabin area because they are warped and leaking. It seems like a carbon monoxide safety issue. It is definately an engineering failure because of the configuration of the bolt pattern. I understand that it is a common problem for that engine.

- Garibaldi, OR, USA

The contact owns a 2015 Ford F-150. The contact stated while driving 35 MPH, the check engine warning light and service engine warning light illuminated. Additionally, the "Uphill Assist Not Available" and "Advance Service Tract Not Available" messages were displayed. The contact stated that the vehicle idled and was running rough while depressing the accelerator pedal. The contact turned off and restarted the vehicle. The vehicle continued to run rough for 5 minutes and the contact continued driving; however, the failure reoccurred twice within 15 minutes on that same day. The dealer and the manufacturer were not notified of the failure. The vehicle was not diagnosed or repaired. The failure mileage was approximately 111,000.

- Missouri Valley, IA, USA

The contact owns a 2015 Ford F-150. The contact stated while driving 35 MPH, an abnormal banging and crackling sound was coming from the engine. There was no warning light illuminated. The contact was able to coast the vehicle to an independent mechanic and upon inspection, the mechanic determined that the vehicle had experienced engine failure. The contact was then referred to the dealer for assistance by the independent mechanic. The contact initially called North Country Ford (10401 Woodcrest Dr NW, Coon Rapids, MN) and was given a six-week estimate for an appointment. The contact then called another dealer and was given a three-week estimate for an appointment. The vehicle was then towed to that dealer where the vehicle was diagnosed with engine failure. The contact was also informed that the main engine bearing along with both turbochargers needed to be replaced. The manufacturer had been notified of the failure but offered no assistance. The vehicle had yet to be repaired. The failure mileage was 79,689. The consumer stated the vehicle was traded in for a Dodge Ram.

- Andover, MN, USA

After the dealer performed the 100k major service the engine began, periodically, to stall. The stall could occur while stopped (at a light or to make turn), while in park and only idling, or when the vehicle was in motion at less than 25 mph. If it stalled while starting a turn, then there was a serious risk of major collision from oncoming traffic. In said turn, more than a reasonable amount of time or distance was allowed to make the turn safely. However, if the oncoming vehicle did not recognized the vehicle was stalling, or had otherwise failed to properly evaluate the situation early enough then a collision would be likely. A scan of multiple Internet web sites found thousands of people, with model years before and after my vehicle, having the same or similar issue.

- Sandy Springs, GA, USA

When I come to a stop, either at a red light or stop sign, and I have my foot on the brake, and come to a complete stop. The engine would idle rough and then would either die on me, or if I have time, I would put the driver selector switch into neutral and give it some gas before the engine quits. I have a OBD2 reader for my IPad, and when this happens, usually the codes P0365, or P0369 occur. I have had my truck into the shop numerous times to get fixed, and they have replaced the Cam Sensor for those P0365, and P0369 codes, but the problem still exists.

- Wichita, KS, USA

The oil pan is leaking oil and this is a prevalent problem with 2015 through 2021 years of many Ford models. The leaked oil can and is running back onto the vehicle under carrage and is a fire potential when coating the exhaust system which has high heat during operation. The problem has been reproduced and is recognized by the manufacturer. The later model years have had a redesign to attempt to correct the issue however the earlier 2015 - 2017 nothing has been done No warnings or messages are given that this issue is present. Some vehicles have had this repaired at significant cost as many as 3 times only for the issue to reappear again.

- Young Harris, GA, USA

Just replace electronic throttle body for SECOND time at 106,185 miles. First time was at 38,460 miles. Both times replaced by Ford dealer at my expense. Recently contacted Ford with no response yet. THIS IS A MAJOR SAFETY ISSUE. TRUCK STALLS WITHOUT ANY WARNING. VERY DANGEROUS. I have never replaced a throttle body on any other vehicle I have owned in 45 years of driving!!

- Rowlett, TX, USA

The headers are warped accoding to the Ford service garage which is a common ecoboost problem. Could cause carbon monoxide poisoning.

- Garibaldi, OR, USA