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Speaking to German newspaper Die Tageszeitung, which uncovered the error, Dieter Köhler said: “I practically do everything by myself and, as a pensioner, I don't even have a secretary anymore.”
Three years on from dieselgate Europe considers the future of diesel.
Diesel Summit in Brussels urges authorities to make tackling air pollution from dirty diesel vehicles a political priority
New figures show more than 350,000 dirty diesel cars were exported to Poland last year, mainly from Germany.
A Berlin court ruled on Tuesday that the German capital should impose driving bans on some roads for diesel cars whose emissions of nitrogen oxide exceed permitted limits.
Leaders of Germany’s coalition parties have come to an agreement to fix the country’s diesel crisis after marathon talks late into the night.
New emissions standards have led car makers to stop selling many of their most powerful models.
By next year VW must buy back or fix 85 percent of the vehicles involved in the 2015 scandal or face higher payments for emissions
The US Justice Department has filed criminal charges against ex-VW boss Martin Winterkorn, accusing him of conspiring to cover up diesel emissions cheating.
German car manufacturer might replace CEO with former BMW executive Herbert Diess
What happens to recalled diesel cars? Some end up in one of Volkswagen's giant resting grounds.
Germany's ban could prompt its most-polluting diesel cars to be sold to buyers in eastern Europe, experts say. This could export the country's deadly air to Poland, Romania, Bulgaria and the Czech Republic.
Diesel cars sales are declining in Europe but automakers are divided over plans to meet looming EU environmental targets
Analysts expect European legislation to follow in allowing old diesel cars to be prohibited from worst polluted urban areas
The decision is likely to affect millions of drivers and vehicles.
BMW Group and Daimler claim they were not aware the exhaust fumes tests were being tested on humans and monkeys — while Volkswagen concedes some of its employees may have been aware of the testing at the time.