Volkswagen reportedly has said it is making slow progress on fixing cars equipped with illicit engine software in Europe, having repaired less than 10% of the 8.5m affected models.

Germany’s KBA motor vehicle authority has approved proposed fixes that would resolve the problem in about 5.1 million vehicles, Reuters cited the VW manager in charge of the European diesel recall necessitated by the emissions cheating scandal that has engulfed the company as saying.

“Ten percent of this (number) have been retrofitted with good results,” Manfred Bort said in VW’s in-house journal inside published on Monday.

Of the roughly 11m vehicles affected globally, about 8.5m are in Europe.

VW group models with 1.2- litre and two-litre engines require only a software update on pollution control systems, but about 3m 1.6 litre models also require a mesh to be installed near the air filter.

Europe’s largest automaker is in the midst of developing and testing software variants to fix all the cars and will do “everything” to secure the KBA’s approval of its solutions by November, Bort said, according to Reuters.

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The automaker has said the majority of the 8.5m cars in Europe can be repaired this year, but an unspecified number will have to wait until 2017.

“We want to inform all affected customers in Germany by the end of the year that the technical solution is available,” Bort reportedly said.