Apr 5,  · Every Ford product I've owned in the past 15 years has had this feature, you just have to know the magic to access it. On the older Fs and Expeditions, holding the Missing: Pdf. Helped Over 8MM Worldwide · 12MM+ Questions AnsweredA+ Rating – Better Business Bureau. Access Engineering Test Mode. Turn off the truck, open and then close the door to make the dash turn off. Wait till the screens to go black. Hold ‘OK’ button (right side of steering wheel on the .Jul 12, · One of the key aspects of Ford Engineering Test Mode is the ability to access and interpret test mode codes. This entails inputting specific commands and sequences to enter the test mode, and then navigating through the system to identify any error codes or diagnostic information. Jun 7, · Can anyone tell me how to enter into the Engineering Test Mode? I've searched all over and haven't found a way to do it. Press and hold the OK button (on right side of steering wheel buttons) and then press the ignition button. You have to start it and let it run. 1. Start with the engine off, close the door. Access Engineering Test Mode. Turn off the truck, open and then close the door to make the dash turn off. Wait till the screens to go black. Hold ‘OK’ button (right side of steering wheel on the +) for at least 5 seconds and continue holding through the next step. Press the brake pedal and hold it down as well.