BMW, Mercedes-Benz and Porsche have been caught falsifying documents on emission test results and failing to get approval for changes in components, according to the Ministry of Environment.
The latest revelation follows the massive Volkswagen emissions-tampering scandal that erupted in 2015.
The ministry said it will slap a sales ban on 28 BMW models totaling around 80,000 vehicles and fine the carmaker W60.8 billion (US$1=W1,118).
Mercedes-Benz and Porsche face fines of W7.8 billion and W1.7 billion fines. The automakers also face massive recalls if inspections reveal that their cars do not meet emission standards.
BMW will have to pay the highest fine ever imposed by the Korean government on a single automaker. The affected models were imported between 2012 and 2015. Seven of the 28 models are still being sold here, but their sales will be banned later this month.
Eleven Mercedes-Benz models (7,781 vehicles) and five Porsche models (787 vehicles) use components other than those that were authorized by the government.
Earlier, customs officials raided the Korean offices of the three German automakers and seized documents and other evidence. The ministry also accused 14 of their executives of violating customs laws.
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