On 9/18/2015 8:19 PM, Ewald Böhm wrote:
Apparently Volkswagen/Audi cheated on the USA emissions tests since
2009 to 2015 by turning off the EGR to lower nitrogen oxide emissions
ONLY when the car was being tested for emissions.

REFERENCES:
http://blog.ucsusa.org/volkswagen-ca...cle-recall-887
http://www.engineering.com/AdvancedM...EPA-Tests.aspx
http://hothardware.com/news/vw-inten...-482k-vehicles
etc.

My question is HOW did the car *know* it was being *tested* for emissions?


It seems like everyone here is on a VW witch hunt.
I would expect VW to program it's black boxes to use the minimum fuel for a given situation.
If the car is on a dyno, there would be no wind resistance to push against so the fuel system *should* lower the fuel flow.
I'd expect the same behavior if I was rolling down a mountain grade. Sheeeesh!