Oberena scored a well deserved winner two minutes into injury time, to set them off on their Easter break to Scotland in happy mood.
Ardoi took a 12th minute lead, which was cancelled out by a strike from Remacha in the 37th. The game stayed level until the 92nd minute, when right-back Merino grabbed the winning goal, much to the despair of the home crowd in Zizur Mayor.
The win keeps the manguiverdes in the top half of the table.
CD Oberena: Montoro, Merino, Garriz, Capell, Moler, (Ruiz 65th), Gil, Sadaba, (Mendioroz 74th), Jauregui, Remacha, Borda, Zuasti (Jaurrieta 74th)