I assume you are talking about the Ecoboost wet belt?
I think this mainly affects the 1.2 ecoboost.
There is a lot of literature in forums about this, as well as youtube vidoes.
To put it simply, some manufacturers moved to a "wet cam belt" design. Where the belt is sumbmerged in oil in the engine. However, the longevity of this design, or the quality of the belt has proved to be very unreliable. The belt material basically perishes much earlier then expected and the rubber mush clogs the sump filter and starves the engine of oil.
It also affects the 1.2 puretech engines by stellantis.
In anycase, the engine has coined the nickname of "ecoboom" as the first people know about the issue is the oil pressure light, and unless the car is stopped immediately, it can often lead to terminal damage.
So, the current advice is to ensure the belt is checked visually at each service by a mechanic that knows what to look for. The original service interval was 10 years / 100,000 but I think ford now suggest 60,000 and 6-8years. You can usually see the belt by removing the oil cap and having a look inside, you can see the top of the belt.
In terms of maintenance, it seems to be vital that the correct oil be used, specifically that recommended by the manufacturer, and perhaps oil changes to be made more often to reduce the chance of early failure of the belt.
I think ballpark cost is usually £900 (main dealers over £1000) for a belt change, but, it must be done if required as the cost of not doing it will be a new car.
A normal cambelt change should be much cheaper £300-£600+ ish, and replacement interval will be in your service manual.
But....
Having said all that, you need to identify your engine, model. Check for any recalls, etc.
