The Australian Competition and Consumer Commission believes there are at least 155,000 cars with the deadly Takata airbags still on Australian roads.
It is urging drivers to check if their vehicles are affected and book them in for replacement.
The ACCC expects the manufacturer of the Takata airbags to complete their recall of the product in six months.
The recall began in March, 2018, when an ACCC investigation found certain types of Takata PSAN airbags contained a design defect.
The defect may result in the airbag deploying with too much explosive force resulting in the potential of sharp metal fragments hit vehicle occupants, potentially injuring or killing them.
ACCC data shows about 180,000 airbags in more than 155,000 vehicles are yet to be replaced.
"These airbags are extremely dangerous and have the potential to misdeploy, sending sharp metal fragments into the vehicle cabin at high speed, with the potential to kill or seriously injure the occupants," ACCC deputy chair Delia Rickard said.
"It is essential that you do not ignore or delay responding to notices about the recalls from your manufacturer. If your vehicle is under active recall, please act now to arrange for a free replacement."
The recall is the biggest in Australia's history with about 3.66 million airbag inflators replaced in about 2.68 million vehicles.
More than 6000 of those vehicles yet to be assessed are so dangerous they should not be driven at all due to the highest risk 'critical' airbags they contain.
"If your vehicle contains a 'critical' airbag, you should stop driving it immediately and contact the manufacturer to arrange for it to be towed or a technician to be sent to you so the airbag can be replaced," Ms Rickard said.
Consumers who imported a vehicle directly into Australia from overseas are urged to contact the vehicle manufacturer's Australian office to see if it is affected by the recall.
People who imported a vehicle using a business in Australia should check this with the business, and arrange airbag replacements if needed.
"There are only six months left for manufacturers to meet their replacement obligations, and while the compulsory recall is progressing well, it is important to get these remaining deadly airbags off our roads," Ms Rickard said.
- Holden Astra-H (MY 2005-09)
- Opel Astra -J (MY2012-13)
- Holden Astra-J (MY2014-17)
- Holden Trax (MY2013 -18)
- Holden Barina (MY2012-18)
- Holden Cruze (MY2010-16)
- Holden Cascada (MY2015-17)
- Opel Cascada (MY2014)
- Opel Mokka (MY2014)
- Opel Zafira (MY2013)
- SAAB 9-3 (MY2006-11)
- SAAB 9-5 (MY2006-11) Source: GM Holden