The Korean automakers say electronic controllers for the Idle Stop & Go oil pump assembly may contain damaged electrical components that can cause the pump to overheat.

The discovery of child workers at a second Hyundai supplier signals widening scrutiny of labour practices in the automaker's US supply chain.

The revelation of child labour in Hyundai's US supply chain could spark consumer, regulatory and reputational backlash for one of the most powerful and profitable automakers in the world.

Indonesia is the world's largest nickel producer and also rich in cobalt, bauxite and copper ores, key materials in the manufacture of batteries for electric cars.