It seems that all Transit Custom 2.0 vans built between Feb and Sept 2019 were built with injectors that can die at any time. There was a coating used on the inside of the injectors that can come loose and block up. All four injectors and pipework have to be replaced. My Transit with 4200 miles on the clock died on the M4 last Friday. It's now in with the local Ford dealer with an unknown wait but at least 4 weeks. They already had three vans with injectors on back order. One of the Transit forums has mentioned dates running into months as Ford can't get enough new injectors to repair the broken down vans. I've been given a free rental van until mine is back. They have given me a Transit custom, '19 plate with 4400 miles on the clock. I wonder how long that will last :-(
There's more info HERE
There's more info HERE