"DOOR AJAR" signal will not go out
A quick easy fix would to spray WD-40 into each door latch, they tend to get dirty, until you find which door latch is the culprit. If after doing that you still have an issue, one or some of the latches are faulty.
Search Lincoln Continental Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Lincoln Continental Experts