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2015-2016 Transit – Diagnostic Trouble Code P1780 During Key-On Engine Running (KOER) Test
Some 2015-2016 Transit equipped with a 3.5L or 3.7L that are not equipped with a tow/haul button can set P1780 after performing a KOER test.
In these cases, clear the code and no additional action is required as there is no tow/haul button to toggle during the test.
