One of the big holes in the $14.7-billion settlement between the US government and Volkswagen over the automaker's diesel scandal was exactly how the dirty cars might be fixed. In the settlement, payment details were spelled out, but a fix for anyone who might want to keep their car was simply punted with the phrase, "Volkswagen is working on an emissions modification." VW is also working on a solution to its too-dirty 3.0-liter engines, and the California Air Resources Board (CARB) doesn't like what it sees.

The problem, CARB says, is that VW's proposed fix is "too vague," according to USA Today. The EPA agreed with CARB's take, saying that the plan to fix the larger Volkswagen, Audi, and Porsche vehicles was incomplete. CARB's letter read, in part:

VW's and Audi's submissions are incomplete, substantially deficient and fall far short of meeting the legal requirements to return those vehicles to the claimed certified configuration.

VW says this is all part of the process to once again make its diesels clean and that it will continue to work with regulators to find a fix. There are only 16,000 of these larger diesels in California and 85,000 across the country. Overall, almost half a million VW Group diesels are affected in the US.

If you've got a 2.0-liter VW diesel and are wondering what's coming next, check out our FAQ here. On top of the $14.7-billion deal with the feds, CARB also levied $86 million in civil fines against VW.

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