Mazda and Honda are the latest UK car dealers to investigate the safety of their vehicles amid a growing scandal around supplier Kobe Steel.
On Tuesday Kobe admitted it had falsified data about the strength of metals shipped to about 200 companies between September 2016 and August 2017, triggering a safety scare.
Yesterday, fresh revelations showed that data fabrication at the steelmaker was more widespread than first thought.
Honda, which makes around 600 cars a day in Swindon, said aluminium from Kobe had been used in car doors and bonnets.
It said: ‘We will continue to investigate for further detail and will correspond to secure our customers’ safety and security.’
Mazda, which makes all its cars in Japan and Thailand, but imports to Britain, confirmed aluminium from Kobe Steel was used in some models.
It said: ‘We will continue gathering information and quickly investigate the impact on vehicle quality while investigating what actions to take.’