The KBA, Germany’s federal motor vehicle authority, has issued a stern warning to owners of VW Group cars who failed to have their manipulated diesels fixed, as the cars could end up being taken off the road.

Hamburg and Munich authorities have already de-registered multiple Audi and VW models fitted with Euro 5 diesels, after their owners ignored several recall reminders, as reported by Automotive News Europe.

While more vehicles run the risk of being taken off the road in Bavaria as well, their owners have been given a grace period, according to Automobilwoche.

“The recall [for affected VW diesel cars] is compulsory. Cars that are not fixed can eventually be taken out of service. Subject to the release date of the updates, the car owner has had about a year and a half. Plenty of time, to take part in the recall,” said the KBA in an e-mailed statement.

The KBA also revealed that by June of this year, approximately 95% of the 2.46 million affected vehicles in Germany had already undergone the fix. In fact, authorities only had to warn owners in just 0.6% of cases, although by referring complacent vehicle owners to their local registering authority, the KBA began a process that can eventually end with cars being de-registered.

In total, the VW Group admitted to installing emissions cheating devices in 11 million vehicles worldwide, including 5 million in Europe alone.