Down champions Kilcoo, the 2019 and 2021 winners, had been viewed as the favourites after they smashed five goals past Scotstown in a ruthless semi-final display.
And Karl Lacey’s side – who won the All-Ireland title under Mickey Moran in 2022 – opened the scoring after two minutes, a spell of patient possession ending with Eugene Branagan dispatching between the sticks from long range.
But Errigal’s cause was given a serious shot in the arm when they scored the game’s only goal just three minutes later.
Ruairi Canavan slipped a pass to brother Darragh, and while the Errigal captain was seemingly fouled, he had the presence of mind to flick the ball across the face of goal where Oguz was well-placed to punch the ball into the net.
From there, it was a tight game. Kilcoo replied with the long-range free from goalkeeper Niall Kane before Miceal Rooney knocked over to level the sides.
And while Tommy Canavan replied with a free, the men in black and white hit the next three scores during an impressive spell.
Errigal thought they had scored a second goal when Tiarnan Colhoun scuffed the ball home, but referee Noel Mooney stepped in to rule it out because of a square ball.
While Paul Devlin and Darryl Branagan gave Kilcoo a two-point lead, Errigal hit the final two scores of the half through Tommy and Darragh Canavan to level at 1-3 to 0-6 at the break.