Preston beat Ipswich, Derby were held by QPR, while Norwich upset Birmingham.
Preston have moved into the play-off places thanks to Michael Ricketts' early winner against Ipswich Town.
Cardiff have dropped a place despite coming from two-down to claim a 2-2 draw at Southampton.
The Saints were in full control of the game at half-time thanks to goals from Chris Baird and Bradley Wright-Phillips.
However, Cardiff fought back in the second half with efforts from Steve Thompson and Peter Whittingham salvaging a late point.
Birmingham missed the chance to extend their lead at the top after slipping to a 1-0 defeat to Norwich City at Carrow Road.
Darren Huckerby's fine run and shot shortly after half-time ensured The Canaries bagged all three points.
QPR were minutes from claiming a vital three-point haul at high-flying Derby before being pegged back late on.
Martin Rowlands' early goal had The R's ahead, but Darren Moore's late powerful header rescued a point for The Rams.
Leeds bagged a point after coming away from their trip to the Walker's Stadium with a 1-1 draw.
The visitors forged ahead when Robbie Blake lashed home at the second attempt with his left-foot after his original free-kick had struck the Leicester wall.
However, Leeds' joy was short-lived as virtually from the re-start, the home side broke down the left, with Iain Hume heading home to secure a point.
Southend moved out of the bottom three with a last-gasp win over struggling Burnley. Richie Foran's first goal for the club gave The Shrimpers the points.
Luton are now second from bottom after slipping to a 2-1 home defeat to fellow strugglers Hull City.
David Livermore's header and Michael Turner's fine second half strike had The Tigers in firm control and while Drew Talbot pulled one back for The Hatters, it proved nothing more than a consolation.
Wolves' superb run of form came to an end following a 2-1 defeat to Coventry City.
Dele Adebola opened the scoring and things went from bad to worse when Jackie McNamara collected a second yellow card.
However, Wolves still levelled matters through Michael Kightly, but Elliott Ward's 71st minute effort secured the points.
Sheffield Wednesday have moved to within a point of Colchester after a 2-0 win over The U's.
Frank Simek opened the scoring, with Matthew Mills' own goal shortly after settling the contest.
Sunderland fought back twice from a goal down to claim a 2-2 draw at home to Stoke City.
The Potters opened the scoring when Darren Ward made a hash of Darel Russell's harmless long-range shot.
However, within a minute the home side were level thanks to Dean Whitehead's first-time effort from the edge of the box.
Carl Hoefkens' well-taken strike looked to have given the visitors the points before Daryl Murphy's late strike secured a draw.
Click below for match summaries:
Coventry 2-1 Wolves
Derby 1-1 QPR
Leicester 1-1 Leeds
Luton 1-2 Hull
Norwich 1-0 Birmingham
Preston 1-0 Ipswich
Sheffield Wednesday 2-0 Colchester
Southampton 2-2 Cardiff
Southend 1-0 Burnley
Sunderland 2-2 Stoke