With Mitsubishi Motors' fourth round of recalls prompting the government to warn the automaker about its "passive" handling of oil leak issues with its vehicles, the shares of the automaker witnessed their biggest fall - of 11 percent - in 21 months in Tokyo trading.

The slump in the Mitsubishi stock came close on the heels of the automaker's recent announcement that it would be issuing a recall of 1.2 million cars in Japan, for fixing defective oil seals.

Given the fact that Mitsubishi has, in all, recalled 1.76 million vehicles because of the same fault since 2010, the company received a warning from the government about the manner in which it has handled the problem of faulty oil seals in its vehicles.

About the latest recall of 1.2 million vehicles in Japan, the automaker said that the move will affect as many as eight models, including the Minica and Town Box minicars; and will cost the company nearly 7.5 billion yen ($89 million).

With the latest recall leading the Transport Ministry in Japan to announce that it will soon carry out an inspection of Mitsubishi, which has been asked to submit a report, by March, about the improvements it has made to address the `faulty oil seals' problem, Satoru Takada - Toward the Infinite World's Tokyo-based auto analyst - said: "The share price will remain pressurized before the ministry's inspection result is clear."