Cars sold in the Nordic nation have a tax assessed depending on the amount of pollution they emit.
“If it is proved that the emissions were higher than they said then it is possible that certain cars were taxed too little,” Finance Minister Magdalena Andersson said on Sveriges Radio.
Swedish scientist and environmental campaigner Per Kågeson also made headlines as the scandal emerged, revealing that he had warned the EU about car makers rigging emissions tests almost two decades ago.
“Tests carried out by the Swedish exhaust emission laboratory Rototest AB reveal that some manufacturers do not take responsibility for the exhaust performance of all or some of their models in situations when the car is driven under conditions not covered by the official European test cycle,” he wrote in a major EU report in 1998.
The new Swedish inquiry adds to the legal troubles that have mounted worldwide for the manufacturer since the emissions scandal was first revealed on September 18th.
However Sweden was one of the few countries where Volkswagen beat its previous sales records in 2015, while worldwide, sales volumes fell for the first time since 2002.