Tokyo prosecutors Monday formally charged Carlos Ghosn with financial misconduct for under-reporting his salary and also served him a fresh warrant on separate allegations. It represents a stunning turnaround for the 64-year-old Franco-Lebanese-Brazilian executive, a once-revered colossus of the auto sector who won wide acclaim in Japan for saving car giant Nissan. In a move that sent shockwaves through the business world, the former Nissan chairman was arrested on November 19 on suspicion of under-declaring his income by some five billion yen ($44 million) between 2010 and 2015. Prosecutors on Monday pressed formal charges on Ghosn -- and key aide Greg Kelly -- over this allegation, which both men are said to deny. The pair were also immediately re-arrested over fresh allegations that they conspired to under-declare Ghosns income by a further four billion yen over the past three years. Monday was the final day prosecutors could hold Ghosn and Kelly, 62, before either charging or re-arresting them, and the fresh arrest gives them up to another 22 days of questioning. The prosecutors also indicted Nissan for filing false financial statements, making the Japanese automaker culpable for the scandal that has shocked the auto industry. The manufacturer said it would "continue its efforts to strengthen its governance and compliance, including making accurate disclosures of corporate information". The Japanese firms in the three-way alliance with Renault -- Nissan and Mitsubishi Motors -- have both sacked Ghosn as chairman. But amid reports of tension within the tie-up, which outsold all rival groups last year, the three companies last month said they were "fully committed" to the alliance.