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EPA message to automakers: You're on notice

With top administrator Gina McCarthy speaking about the "moral obligation for climate action" on Friday, the Environmental Protection Agency announced it would ramp up its oversight of the auto industry in the wake of Volkswagen's emissions cheating. In a letter sent to manufacturers Friday, the agency said it would begin examining cars to see whether they contained defeat devices "in addition to the standard emissions test cycles." "We are putting vehicle manufacturers on notice." Exactly how the agency plans to test for these devices – which are not devices per se, but algorithms contained in millions of lines of software code that govern vehicle functions – remains unclear. Christopher Grundler, the director of the EPA Office of Transportation and Air Quality, divulged few details in how the agency would uncover so-called defeat devices used by cheaters. "Not today – or actually ever – I'm not going to be describing what new ways we'll be using to detect these defeat devices." Later, he said engineers will have to "come up with some clever ways to do this." The only insight he offered was that the EPA, California Air Resources Board, and Environment Canada would partner on testing more cars for emissions and anomalies. Grundler also said the EPA would diversify its testing fleet. In addition to relying on vehicles provided by manufacturers, the federal agency will now also borrow cars from "private citizens" and utilize rental cars for tests. "We are putting vehicle manufacturers on notice," he said. Joint investigations between EPA and CARB have "been very successful in protecting human health and the environment," said Janet McCabe, the agency's acting administrator in the Office of Air and Radiation. "But we also know, and the Volkswagen violations before us now make it clear, we need to adapt and step up our oversight." That may include an increase in on-road testing in addition to the five emissions tests now more relied upon. The EPA owns and maintains 23 portable emissions-monitoring systems like the one used by West Virginia University researchers who first detected elevated levels of nitrogen oxide emissions from two Volkswagen diesel vehicles. Right now, they're almost exclusively deployed to monitor emission from heavy-duty vehicles, whose NOx emissions "dwarf" the amount produced by light-duty vehicles, which produce less than 2 percent of the total, according to the agency's figures.

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To solve diesel problem, VW might need two fixes

Volkswagen says that a fix is on the way for its 11 million vehicles around the globe that are equipped with diesel engine software that can evade emissions tests. The problem might be far more complicated than simply creating a single solution for all of them, though. According to Automotive News citing Reuters, two remedies to cover different NOx-reducing systems could be necessary, and both potentially affect performance. Earlier examples of the EA 189 diesel engine used a lean NOx trap to reduce the harmful material coming from the tailpipe. According to experts in the Automotive News report, a software update might allow the engines to achieve compliance, but that could affect fuel economy. VW already tried this route once before the scandal came to light, but tests by the California Air Resources Board still showed the figures were too high. Later, some of the 2.0 TDI engines began using Selective Catalytic Reduction that reduced NOx by injecting a urea solution into the exhaust stream. According to Automotive News, a software update for this equipment might increase the amount of the substance used. Not only would that mean topping up the fluid more often, but there still could be some reduction in fuel economy. But, since the 2-liter, 4-cylinder TDI engine that sits inside the diesel vehicles first mentioned as being affected by the issue in the US don't have a urea treatment system, VW would need to install them into these cars. VW still hasn't officially outlined its solution (or solutions) to the emissions issue but is expected to soon. The automaker's long-term evasion of regulations with these diesel engines pumped vast quantities of additional NOx into the air. The substance is known to be linked with smog and acid rain. The US Department of Justice is already beginning an investigation into the company, and politicians are pushing for harsh punishments.