The broadcasting watchdog has launched an investigation into Radio 1 after it aired the song Never Be Like You complete with swear words.
The remix of the song, by Australian musician Flume, was broadcast with two instances of the word f***** on the Dance Anthems slot, by DJ Martin Solveig, live from Ibiza, at 9.25am on a Saturday morning last month.
An Ofcom spokeswoman said: "We're investigating whether a live broadcast of a song breached our rules regarding offensive language."
The investigation comes after Radio 1 Breakfast Show host Nick Grimshaw had to swiftly apologise when Lady Gaga swore live on air on Friday.
In 2014, Ofcom ruled that the station broke broadcasting guidelines when Lily Allen and Ed Sheeran swore on air at the Big Weekend festival.