Frank Lampard's side took the lead through Andrew Hughes' own-goal before Preston's Liam Lindsay was sent off for hauling down Haji Wright.
Coventry controlled possession, but Jebbison poked in Preston's equaliser against the run of play in the 76th minute at Deepdale.
The Sky Blues are five points clear of second-placed Middlesbrough, who maintained their 100 per cent record under new boss Kim Hellberg with a 2-1 victory at Charlton.
Riley McGree and Morgan Whittaker scored during Middlesbrough's dominant first half at The Valley.
George Edmundson's own-goal reduced the deficit in the closing stages, but Middlesbrough held on to make it three successive wins under the Swede, who took charge following Rob Edwards' move to Wolves.
Tonda Eckert's impressive start as Southampton manager gathered pace with a sixth victory in seven games as the Saints beat West Bromwich Albion 3-2 at St Mary's.
Championship top scorer Adam Armstrong struck twice before half-time to take his tally to 11 after Leo Scienza set the hosts on their way with an early goal.
Goals from Karlan Grant and Nathaniel Phillips gave West Brom hope, but the visitors have lost their last seven away games.
Swansea earned their second win in four days to ease their relegation fears as Liam Cullen sealed a 1-0 win over Portsmouth.
Sheffield United's four-match winning run came to an end as they were held to a 1-1 draw by lowly Norwich at Bramall Lane.
Todd Cantwell's 78th-minute penalty earned Blackburn a 1-1 draw against fellow strugglers Oxford.
Vivaldo Semedo's equaliser for Watford in the seventh minute of stoppage time salvaged a 1-1 draw that denied Sheffield Wednesday their second league win this season.
Charlie McNeill had put bottom of the table Wednesday ahead at Vicarage Road, while Imran Louza missed a penalty for Watford.