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Old September 29th 15, 02:18 AM posted to alt.home.repair,rec.autos.tech,sci.electronics.repair
SMS SMS is offline
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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 9/20/2015 3:49 PM, sms wrote:

snip

I had a smog check this morning on a 2007 Camry. The shop had a new
machine for newer vehicles. Since September 2013, 2000 and newer
vehicles no longer get tested on the dynamometer and no longer get a
probe shoved up their tailpipe. The whole test is done via the OBD-II
port (as well as a visual inspection).

For diesel vehicles you can see the details he
http://www.smogtips.com/diesel-smog-test.cfm

So clearly VW was not just looking at wheel rotation, they probably
turned on the emission controls whenever they detected something reading
the sensors. I wonder if an ELM327 transceiver or a Progressive
"Snapshot" would have any effect.