The first reports from the Japanese media, emerging on Monday morning UK time, were dramatic enough: prosecutors had descended on Nissan’s corporate headquarters to question the firm’s chairman, Carlos Ghosn, on financial ‘irregularities’. But the speed at which events that will have a profound long-term impact on the industry unfolded throughout the rest of the day was simply extraordinary.

Normally, the large scale of major international car firms means that it can take time for the impact of major events to be felt: for example, look at how long it it took for the Dieselgate saga to play out at Volkswagen following the initial reports. But events at Nissan today (Monday) have taken place at a simply dizzying pace.

Nissan to oust boss Carlos Ghosn due to 'serious misconduct'

Within an hour of the first reports, Nissan issued a statement that it had contacted the Tokyo district public prosecutors office following an internal investigation sparked by a whistleblower – and that the evidence that investigation had unearthed against Ghosn and representative director Greg Kelly was serious enough for CEO Hiroto Saikawa to recommend the board remove both from their roles.

Within four hours of the first report, Saikawa was sitting in front of the Japanese media that had hastily assembled at Nissan’s Yokohama HQ, with numerous others (myself included) watching on via Nissan’s YouTube channel.

While limited in what he could say for legal reasons, a clearly emotional Saikawa was humbled, apologetic and at times brutally honest when issuing his statement and answering a series of questions from reporters.

Having laid out the three areas in which Nissan had found ‘serious misconduct’ by Ghosn and Kelly, Saikawa offered his “deep apologies”, promising “immediate and fundamental” steps to prevent such incidents happening again.

While Saikawa was speaking in Japan with his words translated, his emotion was clear – as was his anger. At one point, he said: “Beyond being sorry, I feel big disappointment and frustration and despair. I feel despair, indignation and resentment”, adding that people “will feel the same way” once all the details emerge.

Again, it’s hard to describe Saikawa admitting to feeling despair and resentment without using the term ‘extraordinary’. This went far beyond the sort of perfunctory apology and ‘wait and see’ attitude you might expect from a press conference such as this.

But Saikawa wasn’t finished, expressing his personal opinion that Ghosn’s concentration of power within the Renault-Nissan-Mitsubishi Alliance (the 64-year-old is chairman of all three firms and the alliance) was a key factor in enabling the ‘irregularities’ the firm has unearthed. That was a pointed criticism of how the alliance structure allowed one person to become chairman, and effectively in day-to-day charge, of three technically separate car firms.

He criticised Nissan’s “weak” corporate governance structure, which put so much power in Ghosn’s hands without checks in place and meant the alleged wrongdoing couldn’t be detected. While Saikawa said that Nissan would work “closely” with its Alliance partners on the future, he said the firm would introduce a “more sustainable structure”. 

His criticism about the concentration of power within the Renault-Nissan-Mitsubishi Alliance was significant, hinting at some of the tensions that exist within – especially given that, despite Ghosn's multiple roles, the alliance remains made up of technically separate firms (albeit with stakes in each other), in contrast to, say, the singularly owned Volkswagen Group (although, within that group, each brand is run by separate management teams).