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* Economists warn VW might impact German economy as a whole
* Government and trade body try to calm public
* Some analysts say VW impact should not be exaggerated
* Still, uncertainty of a domino effect remains
By Michael Nienaber
BERLIN, Sept 23 (Reuters) - The Volkswagen emissions scandal has rocked Germany's business and political establishment and analysts warn the crisis at the car maker could develop into the biggest threat to Europe's largest economy.
Volkswagen is the biggest of Germany's car makers and one of the country's largest employers, with more than 270,000 jobs in its home country and even more working for suppliers.
Volkswagen Chief Executive Martin Winterkorn paid the price for the scandal over rigged emissions tests when he resigned on Wednesday and economists are now assessing its impact on a previously healthy economy.
"All of a sudden, Volkswagen has become a bigger downside risk for the German economy than the Greek debt crisis," ING chief economist Carsten Brzeski told Reuters.
"If Volkswagen's sales were to plunge in North America in the coming months, this would not only have an impact on the company, but on the German economy as a whole," he added.
Volkswagen sold nearly 600,000 cars in the United States last year, around 6 percent of its 9.5 million global sales.
The U.S. Environmental Protection Agency said the company could face penalties of up to $18 billion, more than its entire operating profit for last year.
Although such a fine would be more than covered by the 21 billion euros ($24 billion) the company now holds in cash, the scandal has raised fears of major job cuts.
The broader concern for the German government is that other car makers such as Daimler and BMW could suffer fallout from the Volkswagen disaster. There is no indication of wrongdoing on the part of either company and some analysts said the wider impact would be limited.
The German government said on Wednesday that the auto industry would remain an "important pillar" for the economy despite the deepening crisis surrounding Volkswagen.
"It is a highly innovative and very successful industry for Germany, with lots of jobs," a spokeswoman for the economy ministry said.
But analysts warn that it is exactly this dependency on the automobile sector that could become a threat to an economy forecast to grow at 1.8 percent this year. Germany is already having to face up to the slowdown in the Chinese economy.
"Should automobile sales go down, this could also hit suppliers and with them the whole economy," industry expert Martin Gornig from the Berlin-based DIW think tank told Reuters.