Tesla’s NOx Problem: Model X Delay Explained?

Model S - Picture courtesy Tesla

As the maker of tailpipe-free electric vehicles, Tesla is perhaps the last auto manufacturer you’d expect to struggle with an NOx emissions problem. Yet like any other auto manufacturer, Tesla operates factories which produce a variety of emissions including the NOx carcinogens at the center of the recent Volkswagen scandal. In fact, Dailykanban has discovered that Tesla has self-reported an NOx noncompliance at its Fremont, CA factory that may be contributing to delays in the production of the firm’s new Model X SUV.

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Despite Barra’s Denials, GM Diesel Test Results Indicate VW-Style Cheating

DUHzafiraWEB

We’ve suspected for some time that more automakers would be caught up in the Volkswagen emissions cheating scandal, and the first new perpetrator has apparently been identified: General Motors. GM CEO Mary Barra’s insists that VW-style software cheating on emissions tests “is not a condition that exists in our vehicles,”  but the German environmental group Umwelthilfe has sponsored tests that throw that claim into serious doubt [English press release in PDF format here].

In testing of the Opel Zafira 1.6 CDTi, performed at the Bern University of Applied Sciences, GM’s diesel engine passed NEDC cycle NOx tests performed on a two-wheel (single-axle) rolling road but emitted two to four times the Euro6 limit for NOx when the same test was performed on a four-wheel rolling road. This strongly indicates that a software “test mode” exists for this engine, although Opel insists that “The software developed by GM does not contain any features that can detect whether the vehicle is being subjected to an emissions test.” But, says International Transport Advisor Axel Friedrich,  “I have no normal, technically plausible explanation for the emission behavior of the Opel vehicle.”

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