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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.

Audi Q7 E-Tron Quattro TDI Quick Spin

The operating word is quiet. This refers both to the sound inside the cabin of the upcoming Audi Q7 E-Tron Quattro TDI – even with the diesel engine running – and the company's public statements about its plan for this powertrain in the United States. Basically, while Europe is getting the diesel plug-in sometime next spring (a bit of a delay), all we know for sure right now is that the US will be getting the Q7 E-Tron, probably in 2018, and it will have either a 3.0-liter turbodiesel or 2.0-liter turbocharged gas engine. You may now place your bets as to which one you think the public (or, more likely, CARB) will go for. We're guessing 2.0T. Despite not knowing if we'll ever see this E-Tron TDI on our side of the Atlantic, we recently spent an enjoyable morning tooling around the hills outside Madrid, Spain. As we said, this beast is seriously quiet, and impressively so. Driving Notes The Q7 is a big vehicle, but with powertrain that combines electric motors and diesel thrust, there's a ton of low-end torque. The official 0-62 time is 6.0 seconds, which is basically the same as the 6.1 seconds of the non-PHEV Q7. The Q7 E-Tron is about 500 pounds heavier than the already-4,700-pound Q7, but because of its trick powertrain, never felt sluggish in the hills of Spain. This Q7 E-Tron is a parallel hybrid, with the 3.0-liter TDI diesel engine and the 94-kW disc motor both able to drive the wheels. Overall, they provide 373 horsepower and 516 pound-feet of torque. Despite the parallel system, the not-quite-powerful-enough electric motor doesn't provide the complete electric drive experience that EV fans might be looking for. For example, the Q7 E-Tron has a top speed of 139.8 mph, but that's only in hybrid mode. In EV mode, its top speed is just 78 mph. Audi's Virtual Cockpit display, first seen in the TT, remains an ideal way to give you a wealth of information in an easy-to-see format. It's just as slick in the Q7, where you can toggle the size of the gauges and then pick what you want the screen to focus on, whether that's speed limits, infotainment information, powertrain usage, speed, or navigation.

Audi A4 TDI plans scrapped for the US

It comes as no great surprise, but Audi of America president Scott Keogh told Automotive News that the automaker has ditched plans to offer the 2.0-liter TDI-powered A4 here in the US. Despite what you may be thinking, Keogh claims the decision isn't based on the ongoing talks between parent company Volkswagen and US regulators regarding the diesel emissions scandal. (Currently, Audi and Volkswagen are awaiting EPA certification for their diesel engines in the US.) The reason, he says, is that the demand for diesel sedans is low here, particularly when compared to the company's lineup of crossovers. "The marketplace speaks, we listen to the marketplace, and the marketplace told us, 'Go with SUVs,'" says Keogh, presumably in his usual straightforward, assuring manner. That's not to say, though, that one doesn't have an effect on the other. We've already seen that the scandal has had an impact on sales. Now, in a country where many were already under the assumption that diesel engines were dirty and noisy, it's no revelation that automakers are less than enthusiastic about expanding their grease-burning offerings. While the news is a bit of a bummer for those of us who have long hoped for more widespread diesel options here in the States (and for whom the whole Dieselgate debacle is downright depressing), there's still plenty to look forward to in terms of greener, cleaner Audis. At the A3 E-Tron event late last year, Keogh was bullish on EVs, promising that it was just the first step in a "substantial commitment." Audi's plan is, in Keogh's words, to "start with the plugs, come in with the full BEVs and then keep rolling from there." He repeated these assurances at the LA Auto show, saying that he expects 20 to 25 percent of Audi's sales to be plug-in vehicles by 2025. Plus, despite the whole diesel thing (which, to be fair, affects far fewer Audi cars than Volkswagens), Audi has been killing it lately. February sales marked a streak of 62 consecutive months of record sales in the US. For an automaker that is repeatedly saying that it believes the future is in electrification, this bodes well for us. Related Video: