Original sentence: In September 2015, German car maker Volkswagen AG was found to have used software to cheat on emissions tests for 11 million of its diesel engine Volkswagen, Porsche and Audi-branded cars sold between 2009 and 2015.The company has apologized for the action and is facing legal proceedings, regulatory investigations, and class action lawsuits in multiple countries.The software defeat device was found after a series of investigations of Volkswagen's diesel engines by the EPA and the California Air Resources Board.This resulted in car models passing United States Environmental Protection Agency (EPA) tests while in real-world driving emitting up to 40 times the legal limit of nitrogen oxides (NOx)
Edited sentence: In September 2015, German car maker Volkswagen AG was caught using software to cheat on emissions tests for 11 million of its diesel engine Volkswagen, Porsche and Audi-branded cars sold between 2009 and 2015.The company has apologized for the scandal and is now facing legal proceedings, regulatory investigations, and class action lawsuits in multiple countries.The deception resulted in car models passing United States Environmental Protection Agency (EPA) tests while in real-world driving emitting up to 40 times the legal limit of nitrogen oxides (NOx).The software defeat device came to light after a series of investigations of Volkswagen's diesel engines by the EPA and the California Air Resources Board