Saab has said that it is searching for a successor, helped by Mr Jonsson who will remain available as such until 1 September, 2011.

Saab chairman Victor Muller is to act as temporary president and CEO until a replacement for Mr Jonsson is found. 

His departure comes as the firm looks to launch a raft of new products, including a new 9-3.

Mr Jonsson said: 'I have been with Saab Automobile for almost my entire career of 40 years, of which almost six years as the head of Saab Automobile. The last three years have of course been very demanding and forced me to focus on one thing only – my work. Now it is time for me to also spend some time on other things that had to stand back for my duties to Saab Automobile.

'We have already accomplished so many things that many thought were impossible and I am convinced that Saab Automobile is on the right track towards replacing the entire product portfolio by October 2012 – when the next-generation 9-3 will be launched – as well as creating a stand-alone company with a financially sound business model.'

Mr Muller said 'Jan Ake has not only been instrumental in Saab Automobile’s survival but also in the transition of Saab into an independent car company. I am really sad to see him leave, but understand and respect his rationale. He has had one of the toughest jobs in Sweden in recent years and I am grateful that he has transferred his knowledge and experience to the managements of Saab Automobile and Spyker Cars NV. Jan Ake has led the efforts to create a platform from which Saab will become a strong and independent Swedish car manufacturer.'