Nissan has denied the allegations made by South Korean Ministry of Environment (MOE) that its UK-built Qashqai SUV diesel models were fitted with emissions defeat devices.
The South Korean Ministry of Environment found that Nissan Qashqai models were arbitrarily setting the engine system to illegally control emissions.
The Government of South Korea said it plans to fine Nissan £195,000 for manipulating emissions tests.
The company has however denied the claims, saying that the 814 Nissan Qashqai's sold in Korea have been correctly homologated as required by the MOE.
Nissan chief communications officer Jonathan Adadhek said: "As a company that builds some of the world's best-loved cars, we are proud of our products and our reputation for innovation and quality.
"We are committed to upholding the law and meeting or exceeding regulations in every market where we operate.
"Any suggestion that we have not complied with regulations and are illegally controlling gas emissions is wrong."
The company noted that the testing and conclusions reached by the MOE are not consistent with those of other regulators who have themselves undertaken stringent testing.
Authorities in the European Union found that the Nissan vehicles they tested - including the Qashqai - were fully compliant with homologation standards.
Nissan said the Qashqai sold in Korea complies with - and has been homologated to - European Euro 6 standards and Korean regulations allow the importation and sales of vehicles that comply with these standards.
Adashek said: "We are in the process of responding to the MOE about their findings and will continue to work transparently with them so they clearly understand the situation regarding the Qashqai's engine system."
last year, Volkwagen had admitted to cheating on emissions. Most recently, Japanese automaker Mitsubishi had confessed to cheating on fuel efficiency in its vehicles.
