Volkswagen Group admits that 3.0-litre V6 TDI engine violates USA emissions regulations

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VW_Claim-de_4C_M Audi will revise, document in detail, and resubmit for US approval certain parameters of the engine-management software used in the V6 TDI 3.0-litre diesel engine. That is the result of the discussions held between a delegation from Audi AG and the US Environmental Protection Agency (EPA) and the California Air Resources Board (CARB). The updated software will be installed as soon as it is approved by the authorities. The three brands Audi, Porsche and Volkswagen are affected. Audi estimates that the related expense will be in the mid-double-digit millions of euros.

The latest discussions focused on a notice of violation of November 2, in which Audi was informed that AECDs (Auxiliary Emission Control Devices) were not sufficiently described and declared in the application for US type approval. That will now be done with the updated software and the documentation.

Audi has confirmed that three AECDs were not declared in the context of the US approval documentation. One of the AECDs relates to the temperature conditioning of the exhaust‑gas cleaning system. The other two AECDs are for the avoidance of 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.

Audi has agreed with the environmental authorities on further steps of cooperation in which the concrete measures to be taken will be specified. The company has committed to continue cooperating transparently and fully. The focus will be on finding quick, uncomplicated and customer-friendly solutions. The voluntary sales stop for models with the V6 TDI diesel engine, which the three affected Group brands had provisionally decided upon, has been extended until further notice.

This engine was developed by Audi and is used in the Audi US models A6, A7, A8, Q5 and Q7 from model year 2009 onwards. Volkswagen uses the engine in the Touareg and Porsche has used it in the Cayenne since model year 2013. All affected models continue to be safe and roadworthy.

3 Responses

  1. It would seem Mercedes incorporate a defeat device based upon ambient temperature, when ambient temperature is below a threshold, emission levels are allowed to rise:
    “he Netherland’s official automobile inspector TNO, on behalf on the Dutch Minister of the Environment, conducted an on-road tests of a C-Class Mercedes C220 TDi BlueTec diesel and determined it emitted more than 40 times the amount of cancer-causing NOx than in the lab test.[10] The tests were done at temperatures below 10 degrees Celsius (50 F). Mercedes says it is permissible for the BlueTec engine to emit 40 times more NOx when the temperature is less than 10C (50 F)”

  2. USA Court has approved a financial settlement for owners of defeat device equipped VW diesel cars. It is basically a buy back scheme, where owners receive the pre-September 2015 value of their vehicle plus a cash figure of several thousand dollars.

    Here is the announcement:

    An option is also to keep the vehicle an have the emission sproblem fixed, as there is still no fix to meet compliance I would think most owners will dispose of their cars

  3. The latest news (July 2016) is the USA authorities have rejected the technical solution offered by VW to achieve compliance for the emissions of the 3.0 litre engine.

    Expect to see another buy back settlement on top of the $ 15 billion for the 2-litre engine.

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