JEREMY Clarkson has denied posting a photograph making a lewd comment about a "slope" on Twitter.
The Top Gear presenter posted a photo of a sign reading "entrance to slope" with the comment "this is just obscene" from his account.
But Clarkson, who was accused of using the racially offensive term "slope" while filming earlier this year, denied composing the tweet.
The 54-year-old, who is on a final warning at the BBC, deleted the picture and wrote: "That last tweet wasn't from me".
The presenter claimed someone else posted the photo after leaving his phone unattended.
He tweeted: "It seems you can access a fingerprint iPhone using a number code. Must stay across these things."
In July, Clarkson was found to have breached Ofcom rules by using the word "slope" in a Burma Special edition of the show broadcast in March.
Clarkson used the term to refer to an Asian figure walking over a bridge that he and co-hosts James May and Richard Hammond had built.
"That is a proud moment, but there's a slope on it," he said.
Earlier this year, footage emerged of the controversial presenter using the n-word while filming Top Gear in a clip that was never aired.
Clarkson appeared to use the word when reciting the children's nursery rhyme "eeny, meeny, miny, moe" to choose between two cars.
Director General Tony Hall said yesterday that the BBC had "long discussions" about whether he should leave the motoring programme following his use of racist language, but decided not to fire him from the show.
Actually, that last tweet wasn't from me.— Jeremy Clarkson (@JeremyClarkson) November 14, 2014
Yes, I'm back at the helm now.— Jeremy Clarkson (@JeremyClarkson) November 14, 2014
It seems you can access a fingerprint iPhone using a number code. Must stay across these things.— Jeremy Clarkson (@JeremyClarkson) November 14, 2014
Lord Hall told The Times: "You've got to have the right boundaries. But nothing was broadcast, they were absolutely remorseful about any hint that they were saying or doing anything racist…There are millions of people who feel that Top Gear….reflects them and their interests and we've got to respect that."