One problem related to engine shut off without warning has been reported for the 2018 Lincoln MKX. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2018 Lincoln MKX based on all problems reported for the 2018 MKX.
We had our first incident on Aug 2 when my wife was driving. Car stalled at a traffic light and she restarted it . Transmission was in drive and she started to accelete to go ahead. The car itself went into reverse and almost hit the car behind her. She was extremely shaken and refused to drive it again. She called a towtruck to take it to our dealer. The dealer could not find the problem so installed an electrical device to record another incident. It then happended when I was driving, only 2 days after we picked it up from the dealer. I was driving on a 50 mph road when the "engine has shutdown" flashed on the instrument panel I got it restarted and tried to continue driving. About 10 different fault codes appeared and we took cell photos of each code. It shut down again a few miles later and this time all systems shut off. No lights no power on engine start. Totally dead I pushed all the shift buttons and after a minute it restarted. At this point we had it towed back to the dealer. Dealer has had it another 10 days and cannot find the problem. For our safety we refuse to take it back without the problem being solved and are now complaining directly to Lincoln.