US: Audi to revise the software fitted on 3.0-litre engines image

Audi stated it would revise and resubmit for US approval certain parameters of the engine-management software used in the V6 TDI 3.0-litre diesel engine.

The US Environmental Protection Agency and the California Air Resources Board have recently announced that they will inspect every Volkswagen and Audi car powered by the 3.0-litre diesel engine, from years 2009 to 2016, which means another 85,000 cars to add to the investigation. Audi complied and announced it would submit new applications for US government emission certification for the revised software. That is the result of a meeting between delegates from Audi and the US EPA and CARB, in which the VW’s brand has committed to install the updated software as soon as it is approved by the authorities. The three brands Audi, Porsche and Volkswagen are affected, and Audi estimates that the related expense will be around 50 million dollars.

The latest discussions focused on a notice of violation from November 2, in which Audi was informed that three AECDs (Auxiliary Emission Control Devices) were not sufficiently described and declared in the application for US type approval. One of the AECDs relates to the temperature conditioning of the exhaust gas cleaning system, while the other two are for avoidancing deposits on the Ad-Blue metering valve and of HC poisoning of the SCR catalyst with unburnt hydrocarbons. One of them is regarded as a defeat device according to applicable US law. Specifically, this is the software for the temperature conditioning of the exhaust-gas cleaning system. The 3.0-litre V6 diesel engine in question is being developed by Audi and is used in the US models A6, A7, A8, Q5 and Q7 from model year 2009 onwards, while Volkswagen uses the engine in the Touareg and Porsche powers its Cayenne since model year 2013.