Here’s How VW Tricked the EPA’s Emissions Test

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Here’s How VW Tricked the EPA’s Emissions Test

Details have surfaced on exactly what Volkswagen did to trick the EPA’s emissions test.

The Volkswagen and Audi diesel vehicles in question feature a “Dyno” and “On Road” mode, the previous of which is used for testing purposes when a vehicle is on a dynamometer. Since testing for vehicles is often done on dynos, a test mode is necessary so that other safety features such as traction control and stability control do not kick in. While having a testing mode or dyno mode isn’t illegal or even misleading, Volkswagen’s version had its diesel engines perform differently than they would in the real world.

SEE ALSO: Everything You Need to Know About VW’s Diesel Scandal

Essentially, when the vehicles were put into the dyno mode for testing, the engines were detuned to meet emissions targets. Once the vehicle was restarted and taken out of test mode, they emitted 40 times the federal standard of nitrogen oxide.

Currently, the affected models from VW’s diesel scandal include: 2009-2015 Audi A3, 2009-2015 Volkswagen Jetta and Jetta SportWagen, 2009-2015 Volkswagen Beetle and Beetle Convertible, 2009-2015 Volkswagen Golf, 2014-2015 Volkswagen Passat and 2015 Volkswagen Golf SportWagen.

[Source: Consumer Reports]

Discuss this story on our Volkswagen Forum

  • smartacus

    Ho My Gawd,
    Hey Mergio Sergio!!
    That spouse you’ve been praying for may be falling in your arms soon!!!

  • Dave Foley

    Wouldn’t THAT be funny if VW Group had to merge under FCA over this! Hahaaa!!

    But don’t blame Windercorn. This all took place under Piech’s watch.

  • Dave Foley

    Wouldn’t THAT be funny if VW Group had to merge under FCA over this! Hahaaa!!

    But we can’t blame Windercorn. This all took place under Piech’s watch.

  • 01566

    Windercom was head of R&D when this happened therefore his fingerprints are all over it.

  • Dave Foley

    Ahhh. I didn’t know that. Apparently he was head of “Research and Deception”. 😉

  • danwat1234

    So, with DEQ testing, do they dyno test the diesel or just plug in the OBD2 connector and query the computer? Then it wouldn’t be in dyno mode…, then somehow it’s been passing, because we haven’t heard of it until now, so it forges the sensor log data too..