Ferg

Identical issue -- 2012 MKZ Hybrid -- just wanted to help someone else out one day who had to go through the labyrinth I did. This issue seems to only come up randomly and only when the car goes from electric power to gas power. Lincoln Warning Light.mp4 1. My local mechanic felt it was a cylinder head temperature sensor. Replaced that, the manifold gasket, and coolant while we were in there, and the cylinder head sensor connector. That did NOT WORK, $600 later. 2. Lincoln dealer kept if for several days and, after sending him the video below AND taking a screen shot of the nanosecond when the warning chime comes up, he did three things. He said the screen shot was the most helpful clue, even though I showed him the video below. One of these three things solved it, I don't know which one it was. A) He reprogrammed the PCM and the BECM B) Some random wiring connector, grey in color, wasn't connected. He reconnected it but thought it was remarkable that, even when it was disconnected, no codes came up. C) He replaced the transmission temperature sensor. While I'm not a mechanic, I feel like this was the actual solution. $566 later, it's fixed.