So for more info about Engineering Test Mode, refer to this webpage https://fordfusionhybridforum.com/topic ... test-mode/
To get into Engineering Test Mode:
- Enter vehicle with key.
- Hold down "OK" button on left hand spoke of steering wheel.
- Press and release the "Start" button.
- Continue to hold the OK button for 5 seconds, or until you see a yellow "ET" in the upper left corner of the left instrument cluster display.
- Use the OK button to clear the messages.
- Use the up and down arrow buttons on the left hand spoke to move through the different items.
- Exit Engineering Test Mode by pressing the Start button a second time.
Probably the most useful feature is the ability to display DTC codes.