Almost one million cars fitted with potentially deadly Takata airbags remain on Australian roads, a year after they were recalled.

The Australian Competition and Consumer Commission on Tuesday said about 70 per cent of affected inflators – about 2.8 million – have been replaced nationally since manufacturers were put on notice in February 2018.

But one million airbags in more than 900,000 vehicles still require replacement. Nearly 8,000 of those are the high-risk alpha airbags. Most are in NSW and Victoria.

‘Despite good progress, both motorists and car manufacturers shouldn’t become complacent,’ ACCC deputy chair Delia Rickard said in a statement.

‘If you receive a letter or call from your car’s manufacturer, don’t delay or ignore it.’

All airbags need to be replaced by December 2020.