Chris Huhne and his former wife Vicky Pryce were both charged last year with perverting the course of justice over the allegation, said to relate to a speeding offence in 2003.
Pryce previously pleaded not guilty on the grounds of marital coercion and Huhne today also entered a not guilty plea to the charge.
Former Energy Secretary Huhne, 58, from Dutton Lane, Eastleigh, Hants, stood down from the Cabinet following the charge last year, but remained the Lib Dem MP for Eastleigh.
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No-one was on board the single-decker vehicle, Humberside Police said.
The disgraced film producer has been the subject of an investigation in the US into allegations that he sexually assaulted numerous women.
Pyongyang said it is ‘willing to give the US time and opportunities’ to reconsider talks ‘at any time’.