View Single Post
  #236   Report Post  
Old October 5th 15, 03:33 AM posted to,,
SMS SMS is offline
external usenet poster
First recorded activity by DIYBanter: Aug 2006
Posts: 1,365
Default EPA caught VW cheating - how does the car know it's being tested?

On 10/4/2015 2:39 PM, Klaatu wrote:
"Ewald Böhm" wrote in message
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.



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

According to NBC, the emission controls were altered when only the front
wheels were turning, as on a dynometer.

I don't know about diesels, but newer gasoline powered cars in
California don't use the dyno anymore. The levels are all read from the
sensors via the OBD-II port, at least in California.