engine replacement

We are in the process of purchasing a 2015 Genesis Sedan and the Carfax reads that the engine was replaced in April 2016 at 20k miles. Any advice on a full engine replacement? Has anyone had this work done? Worth the purchase? Good or bad?

Last Thursday night I was driving home from dinner with friends, cruising at about 70-75 mph when my check engine light started flashing. Suddenly, all the lights on the instrument panel lit up and the pedal went dead. Luckily I was carrying enough speed to exit the freeway before finally...