The car - which Sir Jimmy called "The Beast" and still has his personalised JS 247 plate - is expected to be the highest priced single item at the sale in Leeds.
It was bought by an internet buyer as hundreds of people packed Savile Hall in the Royal Armouries complex.
More top news
A detective who helped bring the double murderer to justice says he could also have killed Ms Lawrence, who has been missing since 2009.
Emmerdale actor John MIddleton has joined around 3,500 people taking part in a memory walk in Leeds.
Labour's candidate for the Batley and Spen seat, which was left vacant following the killing of Jo Cox, has been canvassing in Cleckheaton.