SEJONG -- South Korea's antitrust regulator said Sunday it has decided to order Nissan Motor Corp., Porsche AG and their two Korean units to take corrective steps for falsified information over gas emissions of their diesel cars.

Nissan Motor, Nissan Korea, Porsche and Porsche Korea are alleged to have stated false information about gas emissions of their diesel vehicles imported for sale in South Korea, according to the Korea Fair Trade Commission (KFTC).

The KFTC also decided to impose a fine of 173 million won ($146,700) only on Nissan Korea.

Illegal software installed in their cars caused gas emission reduction devices to not fully operate during normal driving conditions.

The practice meant that the cars did not meet permissible emission levels, but the automakers falsified such facts in signs attached to their cars, according to the commission.

In September, the regulator fined Audi-Volkswagen Korea and Stellantis Korea a combined 1.06 billion won for similar allegations over gas emissions. (Yonhap)