In article ,
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.../VW-Caught-Che
ating-on-EPA-Tests.aspx
http://hothardware.com/news/vw-inten...oftware-to-che
at-emissions-tests-forced-by-epa-to-recall-482k-vehicles
etc.

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

I'd like to know how the EPA found out about this hack