Oxford hit the woodwork four times and missed out on the chance to go second in the table by drawing with York.
Striker Julian Alsop struck the bar twice with two fine headers and also nodded against the post in injury-time.
But the Minstermen will not complain having picked up just one point from a possible 21 prior to the game.
Stuart Wise went closest for the visitors with a header while Oxford's Mark Rawle was also denied by the bar with a late header.
Oxford Utd: Woodman, McCarthy, Crosby, Bound, McNiven, Whitehead, Quinn, Hunt, Robinson, Alsop, Steele. Subs: Hackett, Ashton, Waterman, Rawle, Scott.
York: Ovendale, Wood, Brass, Wise, Davies, Ward, Walker, Merris, Dickman, Bullock, Nogan. Subs: Cooper, Smith, Yalcin, Porter, Bell.
Referee: G Salisbury (Lancashire).