of Porsche shares for 4.46 billion euros (US$5.58 billion) on 1 August 2012 to avoid taxes of as much as 1.5 billion euros, which would have to be paid if the wrap up happened after 31 July 2014. Volkswagen AG purchased the remaining stake in Porsche AG equaling 100% of the shares in Porsche Zwischenholding GmbH, effectively becoming its parent company as of 1 August 2012. Volkswagen AG completed the purchase of 19.9% of Suzuki Motor Corporation's issued shares on 15 January 2010. Suzuki invested part of the amount received from Volkswagen into 1.49% percent of Volkswagen. In 2011, Suzuki filed a lawsuit at an arbitration court in London requesting that Volkswagen return the 19.9% stake. On 25 May 2010, it was announced that Volkswagen Group, through it subsidiary Lamborghini Holding S.p.A., had acquired a 90.1% stake in the Italian automotive design house Italdesign Giugiaro. In less than three months, the transaction had been completed making the Italian firm a member of the Volkswagen Group. Since 2013 the Volkswagen Group has held a 89.7% stake in Traton. In 2015 research showed a security flaw in the keyless ignition of Volkswagen and other carmakers' vehicles. Volkswagen spent two years trying to keep the research from the public domain. On 3 August 2015, Nokia announced that it had reached a deal to sell its Here digital maps division to a consortium of three German automakers—BMW, Daimler AG, and Volkswagen Group, for €2.8 billion. This was seen as an indication that the automakers were interested in automated cars. Volkswagen held a 19.9% non-controlling shareholding in Suzuki between 2009 and 2015. An international arbitration court ordered Volkswagen to sell the stake back to Suzuki. On 17 September 2015, Suzuki paid $3.8bn to complete the stock buy-back just hours prior to a major scandal about emissions violations engulfing Volkswagen. Suzuki had wished to buy Fiat diesel engines. Bugatti left the Volkswagen Group in November 2021, when the company became part of Bugatti Rimac, a joint venture between Rimac Automobili and Porsche AG. Emissions scandal, 2015 On 18 September 2015, the US EPA announced that Volkswagen had installed a "defeat device" software code in the diesel models sold in the US from 2009 to 2015. The code was intended to detect when an emissions test was being conducted, and altered emissions controls for better compliance. Off the test stand, the controls were relaxed, and emissions jumped