Last week, Toyota suffered a significant loss of over $15 billion in market value due to being exposed for falsifying tests.

• Since May 31, the last trading day before the scandal broke on June 3, Toyota shares have plummeted over 5%, while Mazda shares suffered an even larger loss, declining 7.7%.
• The transport ministry's comprehensive inspection uncovered irregularities in certification applications from automakers Honda, Suzuki, and Yamaha Motor.

Since Monday, when the transport ministry discovered false data used to certify certain models, the shares of Japanese automakers have mostly declined.

Since the scandal broke on June 3, Toyota's shares have fallen more than 5.4% and the company has lost 2.45 trillion Japanese yen ($15.62 billion) in market value last week alone.

Since May 31, the market capitalization of the country's second largest automaker, , has decreased by 80.33 billion yen, or $511.8 million, while its shares have fallen 7.7%.

The transport ministry discovered inconsistencies in the certification applications of automakers Honda, Suzuki, and Yamaha during a comprehensive examination.

Last week, s stock fell 5.75%, inched down 0.3%, and lost 2.2%.

On Monday, shares of Toyota, Honda, Mazda, Suzuki, and Yamaha were trading higher. Specifically, Toyota's stock increased by 1.7%, Honda's stock gained 2.13%, and Mazda's stock also rose by 1.7%. Additionally, Suzuki and Yamaha experienced marginal growth.

In the case of Toyota and Mazda, the vehicles used in crash tests were falsified, while all five companies submitted false test data.

Toyota has temporarily stopped shipping and selling three Japanese-made models, including the Corolla Fielder, Corolla Axio, and Yaris Cross, following an investigation report from the ministry.

Akio Toyoda, Chairman of Toyota, expressed regret to the company's customers and stakeholders, admitting that seven of their models were tested using methods that did not align with the standards set by national authorities.

Mazda announced the suspension of the Roadster RF and Mazda 2 from May 30.

Despite the announcement, both companies stated that customers can still operate their vehicles.

The Japanese Ministry of Land, Infrastructure, Transport and Tourism announced it will conduct on-site inspections of the five companies where misconduct was reported.

An investigation into safety issues at some 64 models, including 22 sold under the Toyota brand, led to Toyota's Daihatsu unit halting shipments of all vehicles both overseas and in Japan.

In April 2020, Daihatsu admitted that it had falsified side-collision safety tests for 88,000 small cars, which were mostly sold under the Toyota brand.