I just join this forum to see what others were posting about the door ajar problem on the 2011 MKX. I now have this problem full time. I just had the (hcu) hydraulic control unit replaced because the brake pedal started going almost all the way to the floor before I could stop the car. I had asked the dealership to also check the issue with the door ajar & dome light staying on. Their diagnosis was that it could be related to the fact that my battery was not performing to full capacity, and I should replace it with a Motorcraft battery. I will do that but has anyone else made a connection between the battery and the door ajar problem?
