Porsche Hopes for CARB, EPA Approval on Cayenne Diesel Fix by End of Month
VW Group Proposal to Fix 2.0L TDI Rejected by CARB
The Volkswagen Group and its affiliated brands are struggling to redeem themselves in the eyes of the car buying public but, most importantly, in the eyes of regulators, which have imposed a sales freeze on some 2016 models pending on-road testing to verify emissions compliance. For the most part, the VW Group’s premium brands, Porsche and Audi have avoided much of the negative PR that has beset the Volkswagen brand.
However, the brands have not been completely immune. Audi sells both the 2.0L TDI I-4 and 3.0L TDI V-6 in its models, and Porsche offers the 3.0L TDI V-6 in the Cayenne SUV. According to Reuters, representatives from Porsche said they had a “positive and constructive” discussion with U.S. regulators regarding its proposed fix for the V-6 models.
However, the California Air Resources Board (CARB) recently rejected VW’s proposed fix for the 2.0L TDI as “incomplete, substantially deficient, and fall short.” Newly appointed VW Group CEO Matthias Mueller continues to assert that the emissions scandal is a result of technical issue, not any sort of ethical malfeasance. Many within the industry and reportedly within VW itself have been critical of Mueller’s insistence that there was no ethical issue.
The 3.0L TDI engine has a urea fluid selective catalyst reduction (SCR) system, as well as the 2015-and-newer 2.0L TDI engine, potentially making the fix on those engines a matter of a software reflash. Older TDI models do not have such as system, and bringing those models into compliance with NOx emissions standards will be more of a challenge.