By Emma-Victoria Farr and Andres Gonzalez LONDON (Reuters) -German online car dealer MeinAuto is preparing to put itself up for sale after being forced to scrap plans for a stock market listing last year amid an industry downturn, according to four sources familiar with the matter. The company’s owner, private equity firm Hg, is considering selling to another private equity fund as part of a review of strategic options for the business, the sources told Reuters. Hg aims to get up to 1 billion euros ($1.13 billion) in a sale, according to two of the sources, a figure that would fall short of th…