Audi USA has gone on the record to clarify details regarding the emissions testing issue with the Volkswagen Groupâs 3.0-litre V6 TDI engine and how the company is progressing with the US authorities.
At the beginning of November, the United Statesâ Environmental Protection Agency (EPA) issued a second notice of violation against the Volkswagen Group, claiming that certain cars powered by the companyâs 3.0-litre turbo-diesel V6 engines were fitted with a defeat device, which allowed it to illegally pass American emissions testing for NOx (oxides of nitrogen).
The EPA alleged that the engineâs control software was able to detect an emissions test and enter a âtemperature conditioningâ mode that limited the output of NOx. When the test is concluded, the engine reverts to operating in its regular configuration, emitting up to nine times the permitted levels of NOx.
According to a statement just released by Audiâs American arm, latest violation notice relates to âAECDs (Auxiliary Emission Control Devices) [which] were not sufficiently described and declared in the application for US type approvalâ.
The company has confirmed that three AECDs were not fully declared to the EPA. One AECD is responsible for âtemperature conditioning of the exhaustâ'gas cleaning systemâ, another is designed to avoid âdeposits on the Ad-Blue metering valveâ, while the last one prevents â[hydrocarbon] poisioning of the SCR catalystâ.
Audi claims that the temperature conditioning AECD is âregarded as a defeat device according to applicable US lawâ.
The luxury brand is currently working on updating its documentation and software for the cited devices. It has âagreed with the environmental authorities on further steps of cooperation in which the concrete measures to be taken will be specifiedâ. Audi has âcommitted to continue cooperating transparently and fullyâ, and the focus is now on âfinding quick, uncomplicated and customer-friendly solutionsâ.
Audi was responsible for the development of this engine, which has been used in the A6, A7, A8, Q5 and Q7 models sold Stateside since the 2009 model year. The 3.0-litre V6 TDI has also been used in the Volkswagen Touareg and Porsche Cayenne since the 2013 model year. Note that model years in the US can start up to 12 months ahead of the calendar year.
Since the EPA formally handed in latest notice of violation, the three brands have withdrawn cars with the suspect V6 TDI engine from sale in the USA. This stop sale measure has been âextended until further noticeâ.
There are an estimated 85,000 Volkswagen, Audi and Porsche models sold in the US since 2008 with the affected 3.0-litre V6 TDI.
More: All the news related to the Volkswagen Groupâs âdieselgateâ affair.
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