Preston's 13th draw of the season and second consecutive stalemate was watched by a crowd of13,026.
While Coventry have now gone six games since a win or a clean sheet and have only won once in 15 games since Christmas.
The only notable event of a quiet opening was when home winger Eddie Lewis was booked for a foul on Andrew Whing after 19 minutes.
Richard Cresswell made it 1-0 to Preston in the 27th minute Lewis beat two Coventry defenders down the left and his right foot cross was met by Cresswell seven yards out, whose twisting back header which went in off the left hand post.
Craig Pead made it 1-1 after 52 minutes when he met a left-wing cross 12 yards out and fired his shot past David Lucas It was two-one to the Sky Blues ten minutes later when the home defence failed to deal with a Jay Bothroyd cross and David Pipe deflected the ball in.
John Eustace was close to extending the visitors' lead when he headed against the frame of the goal, before substitute Gary McSheffrey hit the bar.
But Preston grabbed a late equaliser when substitute Pawel Abbott latched onto a Dickson Etuhu pass and produced a clinical finish from ten yards out.