The luxury carmaker said last week it had reported the matter to Germany’s road transport authority KBA, which was concerned about the possible illegal manipulation of emission levels. The KBA had no immediate comment.

Audi said it would update the software of the 4,997 A8 model vehicles with 4.2 litre V8 diesel engines, of which 3,660 are in Germany and were made between September 2013 and August 2017.

The software updates will likely be available in the first quarter of 2018 after winter testing.

“Among other things, the update should ensure that after cold starts the engine more quickly reaches optimal operating conditions for the exhaust-gas treatment system so that its emissions are improved in real driving conditions,” it said. “During the testing, it will be ensured that the new software has no disadvantages for customers in terms of fuel consumption or performance.”

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