Ulrich Hackenberg, who was head of Audi’s R&D operations, and responsible for a wide range of operations at the parent company has resigned.

One of the reasons Volkswagen is now the world’s second-largest automaker is the broad array of brands and divisions it operates. But a new report warns the empire could be at risk of coming undone in the wake of the maker’s ongoing scandal over diesel emissions testing.

To help secure a $21 billion credit line that may be needed to help cover fines and other costs, Volkswagen AG has pledged it will, if necessary, sell off some of its assets, according to a report by the Reuters news service, which quotes “two people familiar with the matter.”

Separately, the scandal continues to shake up senior management at the carmaker. Its Audi brand has named a new chairman, while the former Audi R&D chief has resigned after being suspended for his suspected role in the subterfuge.

In September, the U.S. Environmental Protection Agency accused Volkswagen of installing a so-called “defeat device” on 482,000 vehicles sold in the U.S. so it could pass diesel emissions tests. Otherwise, those models would produce up to 40 times the allowable level of smog-causing oxides of nitrogen. VW officials shortly after acknowledged installing the suspect software in 11 million vehicles sold worldwide.

And after initially denying an additional charge by the EPA, VW has since admitted cheating on emissions with its bigger 3.0-liter diesel, as well as the smaller 2.0-liter TDI engine.

(Reality setting for Volkswagen sales and it’s not looking very good. For more, Click Here.)

The scandal has seen criminal investigations launched in the United States and Germany, while federal judges in the U.S. are this week deciding how to handle at least 350 civil lawsuits filed against the maker. Meanwhile, VW could face more than $18 billion in penalties just for violating the Clean Air Act here, and more fines abroad.

While the final price tag could take a year or more to determine – industry analysts have suggested numbers ranging from $10 billion to more than $50 billion – VW has set aside more than $7 billion and this week lined up a 20 billion euro bridge loan from 13 European banks.

According to the Reuters’ report, VW pledged to sell or list an equal amount of assets should it find itself unable to cover the cost of the one-year credit line. The maker has not yet responded to a request for comment from TheDetroitBureau.com.

What assets could be on the line remains unclear, and it’s unlikely key operations such as the Audi division would be immediately at risk. Some suggest VW could first turn to smaller units, such as non-truck parts operations at the MAN division.

All together, VW now operates more than a dozen different automotive and truck brands, from entry-level Seat and Skoda to super-premium Bentley, Bugatti and Lamborghini. Together, they are expected to generate sales of more than 10 million passenger cars and light trucks worldwide this year, making VWAG second only to Toyota in total volume.

(For more on Volkswagen’s planned spending cuts, Click Here.)

While VW’s financial situation is shaky right now, the company is also dealing with some serious personnel issues, a number of senior managers hit by the scandal. Martin Winterkorn was forced out in late September as chairman of the parent company and subsequently resigned a number of other assignments, including his post as chairman of Audi.

Matthias Mueller, who took Winterkorn’s place as corporate chief executive now takes the empty Audi spot, too.

Meanwhile, Ulrich Hackenberg, who was head of Audi’s R&D operations, and responsible for a wide range of operations at the parent company, as well, has resigned. Hackenberg had been suspended shortly after the diesel emissions scandal broke.

He will be replaced as Audi research chief by Stefan Knirsch, head of engine operations.

While VW – the brand – has been hard hit by the diesel scandal, U.S. sales plunging last month – Audi has largely escaped any public impact. But it uses both of the suspect engines in several models, including the little A3 TDI and the big Q5 TDI.

(For more on the move to consolidate the many VW lawsuits, Click Here.)

It has been running its own investigation into the software subterfuge, Audi Deputy Chairman Berthold Huber today saying “the investigation is making progress,” adding that this “is a necessary and good sign.”

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