My 2015 F250 Lariat needs to have DTE and MPG corrected. I can bring up the engineer test mode by holding down the down arrow then start the motor continuing to hold the down arrow. After a few seconds the gage test begins. The screen lists many items. When I arrow down to the mpg and afe screen I cannot access any way to alter the listed setting.
How can the afe bias be selected and changed?

When I arrow down 4 items are listed in each screen so you cannot isolate any one item. So no there appears that another “button” must be pushed to access one item. Obviously I tried other arrows and the ok button to no avail.

Do you have an 8” or 4” screen?

Between tach and speedo is 4, touch screen is larger- maybe 8 (radio, temp. Etc). The Eng. test is between tach and speedo.

I’m not sure why it won’t work. Have you done any Forscan changes?

No changes. The info screen size is more like 4” x2”. Guess its std. screen for 2015 superduty. The test mode screens must be for current conditions only with no opportunity for formula changes. One would think that if a f150 screen could be changed then why not a f250?
Must be either a different screen is available to effect changes or my sequence is off the mark. I cannot bring up a screen with just one line item on it. Each has maybe 4 lines on same screen.
Thanks for your help.

A difference in my sequence is I had to start the engine before any screen came up. So the only screen shows engine running status.

Think I have tried all combinations with each- ok key and down arrow key. Either there is another way or Ford trests the superduty different from other models!