Captain Tom Clarke scored Preston's winner in the 90th minute with a close-range header to condemn Cardiff to a third successive defeat.
Wolverhampton Wanderers top the standings by eight points from Bristol City and Cardiff while Preston climbed to seventh, one point below the playoff spots.
Millwall beat London rivals Queens Park Rangers 1-0 in Friday's other game thanks to Steve Morison's 55th-minute strike.
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(Reporting by Ed Osmond; Editing by Gene Cherry)
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