Audi is submitting a fix that will hopefully resolve issues with the 3.0-liter V6 diesel engine.

The German automaker will update its emissions control software on over 85,000 Volkswagen Group vehicles equipped with the affected V6 TDI engine. This update will be submitted for U.S. government emission certification for the revised software. According to a statement released by Audi, the updated software will be installed as soon as it is approved by the authorities.

The issue with the V6 engine revolves around the use of auxiliary emissions control software that was not properly disclosed during the time of testing. Audi says that the Auxiliary Emission Control Devices (AECDs) will now be sufficiently described and declared in the application along with the updated software.

In total, three AECDs were used and not declared in the context of the U.S. approval documentation with one of them relating to the temperature conditioning of the exhaust-gas cleaning system. The other two devices are for the avoidance of deposits on the Ad-Blue metering valve and of HC poisoning of the SCR catalyst with unburnt hydrocarbons. It is being disclosed that the software for the temperature conditioning of the exhaust-gas cleaning system is regarded as a defeat device according to U.S. law.

The affected engine is used in various Audi, Volkswagen and Porsche models including the Audi A6, A7, A8, Q5 and Q7; Volkswagen Toaureg and Porsche Cayenne.

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