"The public announcement of the diesel issue by the EPA (US Environment Protection Agency) ... Came as a surprise for the VW management at the time," according to the company's official written response to a lawsuit by German shareholders.
A copy of the 113-page document, which offers an update on the facts compiled so far in VW's own investigation into the global scandal, was obtained by AFP.
It was drawn up by its lawyers as an initial statement of defence against accusations that it deliberately withheld market-sensitive information from investors.
On top of still unquantifiable regulatory fines in a range of countries, VW is facing a slew of legal suits, notably in the US and Germany, from angry car owners, as well as from shareholders seeking damages for the massive loss in the value of their shares since September.
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They accuse VW of violating capital market disclosure rules, saying the carmaker knew about the irregularities long before the scandal broke and should have informed shareholders much earlier because they must have known it would affect the share price.
US authorities had never unilaterally decided to go public with similar accusations against other carmakers, VW argued.
On the contrary, even when allegations of potential violations against the US Clean Air Act had been made, normally an appropriate solution was found with the US authorities behind closed doors, it said.
"In the past, even in the case of so-called 'defeat device' infringements, a settlement was reached with other carmakers involving a manageable fine without the breach being made public," VW argued.
At that stage in September 2015, the negotiations between VW's Amercian subsidiary and the US authorities had already been going on for more than a year.