Is VW’s Fix For Dieselgate Actually Increasing Emissions?

Volkswagen’s efforts to end its ordeal caused by the diesel emissions scandal is not going as planned.

As a matter of fact, it’s been reported that the fix for the affected cars resulted in higher, instead of lower, fuel consumption and, thus, emissions.

In order to fix its 8.5 million VW, Audi, Skoda and Seat models that are fitted with the so called “defeat device” on the 2.0-liter TDI, the company started recalls in January as a first stage in a Europe-wide action. According to German media, during the second wave of recalls, 160,000 WV Passat midsize models have been halted due to a rise in fuel consumption following changes to the engine.

Nevertheless, a VW spokesperson told Automotive News that these claims were just “speculation”, stating that authorities are still checking whether or not the change affects CO2 emissions and fuel consumption.

“We have to guarantee that noise and especially CO2 emissions are exactly the same as before the fix.”

As explained by the official, the recall was delayed due to the Federal Motor Transport Authority’s (KBA) implication, as the organization hasn’t concluded the checks and decided to replace VW’s engineers with independent adjudicators part way through the testing process to ensure “exactness in the testing process”.


  • dufonrafal .

    It certainly is. All the system use in modern diesel to reduce emission increase fuel consumption. And the device use by vw is actually here to reduce fuel consumption.

  • Six_Tymes

    i wonder who invented the marketing term “clean diesel”. pretty much an oxymoron at this point yes?

    • diehard

      A used car salesman. LOL

  • diehard

    The reason for cheating on the emissions was to get better gas mileage rating. So of course the fuel consumption would go up after (and if) the fix.

  • hsvgenfgtsdriver

    It’s pretty simple really. The “dieselgate” problem is to do with a cheat device to hide the excessive NOx emissions. High NOx emissions are caused by a leaner air-fuel ratio (AFR) than the ideal stoicheiometric 14.5:1 (air:diesel) ratio (ie. increased air). Running a leaner mixture increases power and improves fuel consumption but results in a higher level of NOx emissions. To reduce the level of NOx emissions VW need to make the AFR richer (ie. increase fuel). So if you ignore the VW spokesman’s spin and instead look at basic engine principals then it’s obvious that the fix will increase fuel consumption and CO2 emissions especially if they want to the engine to produce the same amount of power. There is simply no other way around it., VW has to reduce the NOx so they need to make the AFR richer. But they have 2 choices. They can either keep the level of air that enters the engine the same as pre-dieselgate which will result in less power and increased fuel consumption and higher CO2 OR they can increase the amount of air in the engine to an amount that will keep the power the same as pre-dieselgate but this will result in even higher fuel consumption and CO2.

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