What can we do to replace the engine on our 2013 Ford Territory?

I am guessing it is a diesel. The diesel is known to blow at quite low kilometres and with no warning. Being just five years old, and having done so few kilometres I would approach Ford for help with the cost of repairs as a gesture of goodwill. They could argue that it is out of warranty, and that you bought it second hand, but I think you could argue that it is not reasonable to have an engine fail in these circumstances.