Stuttering Oxford's play-off hopes suffered another blow as they went down 3-1 at Lincoln - their second defeat in four days.
The visitors looked to have got back into the game after Steve MacLean netted from close range courtesy of a 40th-minute mistake from home keeper Trevor Carson, cancelling out Josh O'Keefe`s early opener, but it was not to be.
Lincoln almost doubled their lead before Carson's blunder when top scorer Ashley Grimes shot inches wide.
Oxford striker Tom Craddock saw a goalbound effort cleared off the line by Imps defender Adam Watts just after half-time.
But it was Oxford's turn to self destruct with a horror five-minute spell in which they conceded two own goals under pressure from veteran striker Delroy Facey.
Harry Worley hooked a 63rd-minute volley from Facey into his own net before Anthony Tonkin repeated the mistake four minutes later when he sliced a Facey cross past his stranded own keeper Ryan Clarke.
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