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Porsche alerts US authorities of 911 emissions issue

The company reportedly used the wrong calculations for the outgoing 911's drag coefficient.

Porsche has reportedly alerted US and German emissions regulators of a potential problem with the previous-generation 911.

Responding to a report in Germany's Der Spiegel claiming the emissions estimates were inaccurate for the 911's 2016 and 2017 model years, Porsche has admitted that it used the wrong drag coefficients to calculate fuel consumption.

"Porsche has identified issues in connection with individual roll-out tests," the company said in a statement to Reuters. "The company is continuing its internal investigations in close consultation with the authorities."

The German automaker may have to revise its fuel efficiency and emissions estimates. The issue is claimed to not involve engine management software, however, avoiding the 'defeat device' trouble that has plagued parent Volkswagen Group for several years.

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